Hinges and Domedrive

Well, this is not as easy as i first thought, the hinges has almost turned my hair grey. I want three function, one is to be able to open it via a switch in the robot(for when i dont have the remote near me) two is to open them via a remote, and last is to have them springloaded for those kids(and adults) that MUST open a hatch).

Anyways here are the hinges( not finished yet)


I have decided on trying the chaindrive rather than the plastic gear version, why? For starters i suits my budget more, and second i can make it myself(wich is the whole idea of this, right?)