RE: sopwith camel
Lots of good suggestions here regarding rolling the airplane to be sure it tracks straight, checking for warps, and taking off directly into the wind. But at best your Camel will be a lot more difficult than any typical sport plane.
I would add two more things to make the plane easier to fly. First, consider dialing in some aileron - rudder mix. The Camel has so much dihedral and such a small vertical that the adverse yaw to give you fits in the air. For starters, try about 10 degrees of rudder when the ailerons are deflected 20 degrees. (That's RIGHT rudder with RIGHT aileron.)
Second, install a yaw rate gyro in the rudder channel. You don't want a heading hold gyro, just a yaw rate gyro. The gyro should be installed such that it gives right rudder when the nose is swung left and left rudder when the nose is swung right. Check that carefully because it's really exciting if you hook it up backwards. The yaw rate gyro reacts much faster that the pilot to veering on takeoff and it will make your airplane feel like it's on rails.
Good luck,
Dick