The Armstrong Class Void Scout (or 'Void Skippers'), was used extensively in the early to mid Frontier Wars era. Before the advent of Jump 3 technology, these little scouts probed J-3 and J-4 systems, carrying enough fuel to make 2 consecutive J-2's in a row, wilderness refuel, survey a system or spy out fleet movements, then carry on before anyone's the wiser.

In times of war they were often deployed in 'feints', stirring up a system's defenses before jumping to a different locale. Because they could enter a system and get their bearings, and jump out as soon as an exit referent could be resolved. The ability to scoop and refine all fuel within 12 hours also made them one of the fastest turnaround elements of the late 22nd century Terran Navy. Their only limiting factor was their overall expense - with near the best computer systems for the tech of the time, though these assets increased the survivability of the Armstrongs, offsetting the expense considerably.

Map Key
1. Gunnery Node - includes Missile storage forward, the triple missile rack itself, a manual gunnery station, and the ship's central elevator. Early engagements resulting in the extensive missile magazine being hit and destroying the whole scout outright, while rare, did lead to a laser based variant - sacrificing most of the cargo deck to a dedicated powerplant and the resulting fuel required to power the weapon system. Only a handful of this variant were ever built - while the ship isn't exactly economic enough for merchanting, the extra cargo -does- become a necessity when these ships go deep behind enemy territory, for extra food, spare parts, and other elements enabling a mission to be extended. One Armstrong, deployed at the outset of the 4th Interstellar War, the Huntington, managed to map gather intel as deep as Zarushagar, not returning until the tail end of the 5th Interstellar War.
2. Bridge
3. Computer Backup Access
4. Common Room
5. through 8. Crew Staterooms. Several scouts assigned to fleet courier duty have combined 5 and 6 into a single large stateroom for the convenience of high ranking officers being relocated to or from fleet elements.
9. Ship's locker. Just outside is access to the cargo deck, and across from the locker is the ship's elevator.
10. Port Engineering. The ship's third Computer Backup is located here.
11. Starboard Engineering. Several crews have reported peculiarities with the Armstrong's starboard - sounds, shadows, odd feelings of unease, that have led to stories of gremlins or the ghost of the Architect haunting his creations. Investigations over the years have reported that as the port engineering tends to get more attention overall due to several important backups being present, the starboard engines tend to get slightly 'out of tune'. Its generally not enough to notice outright, but to the ears of trained engineers, it seems to have led to feelings of unease giving rise to superstitions. A properly tuned Armstrong after an annual overhaul is properly 'purged' of this phenomenon.
12. Jump Drive.
13. Cargo Bay - complete with extendable ramp. Some crews, especially forward observer mission specialists, will sometimes put extra vehicles in the cargo bay - motorcycles and other small off road personal vehicles were the most popular. A few captains with discretionary 'detatched' missions have even been known to do a little speculative trade. The ship's stealth capabilities have even allowed the Armstrong to function as a blockade runner on occasion, delivering a modest amount of supplies posts and positions behind enemy lines. Small science missions will sometimes be assigned an Armstrong by the Terran Navy, and will often carry prefab bases and portable laboratories.
14. Cargo Lock. Blast doors on either side separate this corridor from the vehicle and cargo bays, allowing it to function as an airlock if necessary. Some more lax crews travel with the doors both open by default, just to be able to load the back end of vehicles directly from the cargo bay easier, though this goes against Naval regulation.
15. Vehicle Bay - complete with extendable ramp. Most Armstrongs saw extensive use of wheeled or tracked auxiliary vehicles for exploration/excursion/courier work.

Void Skipping and Void Outposts
Though the Vilani eventually became aware of these ships and their tactics (and detested them), very little was done to counter them other than expend resources to guard all possible gas giants within their known areas of operation - a tactic that quickly becomes untenable for proper force distribution.

Less well known, if at all, was the extensive use (and original purpose) of the Armstrong for jumping to empty regions of space and powering down everything but life support and sensors for a good two or three weeks, then jumping back to refuel and repeat the process. Via this method, tens of thousands of deep space objects were located, their trajectories mapped, and later directly jumped to by an Armstrong for assessment.

Icy bodies were major Naval finds, setting up deep space refueling depots where strategically advantageous or where necessary to expand -away- from the Vilani altogether, toward the rim. Deep space refueling stations were given 'chain designations', such as 'Blackout Base 4' (Hanstone Hex 2608), Blackout Base 5 (Hanstone Hex 2415) or 'Slumber Base 2' (In Aldebaran Sector) with the number afterward being the link distance out from Terra. These refueling bases allowed Jump 2 ships of that time to travel much farther than would be possible otherwise, all thanks to the deep space surveying of hundreds of Armstrongs over many decades.

Blackout Bases extended well past any concerted effort to actually colonize - they were kept as 'back doors' in the case of a Vilani overrun of Terran civilization. Though considered 'top secret' for decades, a few institutions made use of them for special projects or even secret Terran Civ colonies, with the blessing the Terran Navy.

Well before the Long Night fell, even before the Rule of Man came into existence, most of these Void outposts had been long abandoned - the focus of expansion had turned strongly toward the core and established worlds with existing populations and infrastructure - the crumbling Vilani Imperium, making the bases both unnecessary and uneconomical to maintain.

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Location references were taken from https://www.travellermap.com, though this map reflects the area some three millenia -after- the Armstrong scouts were actively used.

Just something I've been doing for my gaming campaign, posting here and on Citizens of the Imperium galleries.