Weighted rims just magnify the effects of spin. I don't think you will be able to create a truly understable gyro disc as the spin will prevent flipping. That being said a dead neutral disc should be very doable. Of course stability is in the eyes of the OATer.
MVP's latest accomplishment instead of designing a driver: making a website.
Next up: revamping the website.
Driver ETA: Now! And it's garbage...
*I am not a lawyer, nothing that I type should be considered legal advice, if you have legal question please contact a lawyer licensed by your state's bar association.