Whatever trainer you choose, I suggest taking out some dihedral on the wing. My first kit build was a Sig Kadet Mk II 25 years ago, then a GP PT-40 10 years ago. If I had to do it over again (and I did a few months ago with the Hobbistar 60 RTF) I would go with a 60 size trainer for size and stability. Look for posts on this subject. And always, find a club to join and go there and meet them, there are many "old timers" who love to chat and offer suggestions.