RE: KMP F-18
It's a nice size, but, will require a ton of work to make it into anything. A good modern 6-8 cell system would probably work fine. You will need to create fan mountings, ducting and reinforce the wings for sure. Then there is the finishing which will need at least a water based polyurethane finish. A cheap initial price, but, a lot of work. A major project in my opinion.