Super cool idea, I've wanted this to exist for a long time. The biggest challenge I see is the not very accurate estimation of measurements for other parts of the body. Could this site be tweaked such that one could adjust hips/calf/shoulders/thigh/arms etc.? For instance, individual hip circumference varies widely based on bone structure, and can only be altered so much by muscle/fat composition delta. Allowing individuals to adjust this measurement in their goals and current status would provide a more realistic avatar. Apologies if this feature exists and I didn't find it
Cheers and thanks very much for the tool!