1.) Cost. 2.) The med models were all male (it makes a big difference), and the height adjustments would have either been a nightmare, or just impossible. 3.) Not all of the bones were made by me. The pelvis is a med-model (the previous didn't have a good reference, and Bondo filler putty is a BAD sculpting material)
In the future I will be using clay prototypes to cast the finals in wood/metal-reinforced resin.