RE: WW1 Kits?
Balsa usa has nice looking and flying WW1 kits from medium electric size up to 1/3 scale gas. They aren't the most scale kits around, but they won't bother most people. And they fly pretty well most are babies. You need to be a student of detail to be bothered by them.
Proctor makes super realistic stuff.. and there are some small electric kit sellers..the site name escapes me at the moment.