I don't think it was a copy of the Curtiss plane. Just the similar shape is a result of the compromise for keeping it balanced because of the heavy engine.
It's not a problem Pal. Just talk to Blacklist. He is able to create and make vinyl masks for the white number "13". The red stars you may "borrow" from other decal sheets for Mig-3 offered widely via the net etc... However Charles can attach them to the masking set too.