How about a TF Contender? The airframe builds fast with the exception of the cowl. It needs a lot of shaping and sanding. It doesn't take a REAL long time to form it just some patience in the carving and sanding area.

When I built mine I put a MDS 48 in it - this turned out to be a mistake. I have it hanging from my basement ceiling waiting for a 60 engine in it. With a ST 75 it would be a very cool plane to fly. The center flap does some good things.