Being a mechanic in this wasteland is obviously tougher than in our world. The scarcity of good parts is the main drawback, then you have to keep the size of your customer in mind. This ranges from giant mutants to bugs and I can tell you a four-cylinder engine will be too small for one and too big for the other.
And don't get me started on payment. This is a Doc Con Dog world and Billy took the habit of rigging his contraptions in case someone thinks of leaving without paying.

Commission for  Dialuca01