I've always felt that there was a mult-model progression between trainer and a twin engined (motored ?) model, with flaps being just one part of the progression.

One has to progress from high wing to low wing, trike to tail dragger, no flaps to flaps, light wing loading to high wing loading, etc.

To me, there is a long distance from going to a first model with flaps, to going to a high wing loaded bird like a B-25.

I suggest that the OP take his time, and progress through the learning curve. This will insure a better chance of success when he moves to a twin, like the B-25.