I wish I was programming-smart enough (and didn't have personal issues taking my time), as that would be a dandy project and to post online, all it would need would be folding bike makers to send their frame geometries, and bike-positioned percentile human models. This would be so much easier with modern parametrically-driven CAD models, you make a model based on linked parameters, and then changing any parameter automatically adjusts the whole model. This was introduced about mid-1990s and is now standard.

Lacking that, a website for bikes like sailboatdata.com, listing fundamental dimensions, would be great. Some of the numbers on that site I can interpret directly, from reading about yacht design, but some interpretations are based solely on comparison to other boats, so having quite a lot of published boats on there, is a huge help. It would be the same for bikes. Sailboat makers don't hold back data, because the very first article about the new boat in Sailing or Cruising World, etc, will publish those numbers, it's expected. Designs that are long out of production, usually an owner or one-design association or sanctioning body for racing a particular model, will contribute specs and a line drawing.