Hi. I'm a complete novice, so please consider such the words of one:
After reading a while on this... what's the actual problem? Broken physics? Incomplete coding?
As someone somewhat in the tech field, having someone try and build something as such and then in the end just say "Oh, can't make it work," really just makes me think that the person is just genuinely retarded and simply has a lot of time invested into similar things. And I don't mean such as a casual insult, but as a genuine "if I was watching this person for a week, I would probably at some point ask them what is wrong with them."
Realistic solutions for such things:
Physics: you could literally post the stuff on a college engineering forum and have someone spit back a legit 3D model with animations within a week tops.
Programming: Again, you could literally post this on a forum and have someone spit the full working code back.
Electronics: Again, you could have any enthusiastic college kid come and do it for you.
All this and waived rights and they wouldn't even bat an eye.
Also, stuff like this belongs on GoFundMe. Not on pre-orders.