A simple reference to get an idea of exactly how big each part is. For some ideas on what's available and possible (and for pricing), look at the styles catalog images in the gallery! They're http://www.furaffinity.net/view/8319805/ and http://www.furaffinity.net/view/8319797/

The smaller rings used are 3/16" inner diameter 18 guage aluminum.
The larger rings are 1/4" inner diameter 18 guage aluminum as well.
The scales are 9/16" wide and 7/9" long.
There are larger scales available that are 7/8" wide and 1.41" long. Pieces made with these scales will be cheaper, but we've never made pieces with these, so we can't give an accurate estimate here!
The bracelet is a half persian bracelet that is about 7" in circumference, just for reference.