RAM,
You think you might like a real EM50 UAV??
I hope you know that the newest of these is 45yo now (78my). Of nearly 13,000 built, there are over 8000 still in use.
Start by opening
GMCMI and try to figure out if this is really something you want to do.
Well, before you go too far along, look at the community that supports these beauties. There are always a few available, but most become available at estate sales, and some at "pre-estate" sales.
There is no structural wood, but if poorly attended, the plywood food may need patching.
The drivetrains are old, While parts are very available, shops that will take them on are not that available. The maintenance required is not difficult or expensive, but it right in line with what one could have expected 50 years ago.
You have to go in with your eyes wide open and having the community for help doesn't hurt either.
What does this guy know? He knows he has had one for 17 years and about 80K (180K total) and we still love it. It is the little size, but that works for the two of us and at one time two dogs.
The Community is what really makes these what they are. If you are still interested, use to link above to find a rally in striking distance and go there for the Sunday Open House.
Matt