I've gone through the pains and a lot of time to simply sketch out my different bike geometries in CAD programs and 3D modelers. So yeah... a tool like what you are describing is probably going to be useful.

A lot of us though just don't download and install things any more. Did you consider if there was a alternative browser option that you could host on a website? Possibly with .net framework which tends to be more accepted than java stuff. And if you host on your own site, then you can possibly add advertising and get some revenue.

Perhaps I'm a minority, but you'd be surprised how many apps I don't have on my smartphone, much less how often I'm willing to download at a whim a program to my PC or Mac as willingly as I did 10 or 20 years ago.