I’ve been messing around with Rthro parts to see what’s possible to make, and legs seems to follow some pretty wacky logic:
The width of the legs (but not feet) is proportional to anthroness. Classic characters with anthro legs will have thighs like tablelegs, a narrow stalk running up to a flat surface.
Rthro arms on a normal character will be shortened. Rthro legs will not, making the character very tall.
Any chance Rthro-Classic compatibility will ever be made less terrible?
This most belongs in #platform-feedback:web-features, but, since I assume by the fact that you wrote this in here that you are a New Member, post these kinds of posts to #bulletin-board next time.