Sometimes I can't leave well enough alone...While waiting to hear back from a buyer about him, I've added a few parts to fill some holes. It doesn't change the robot mode or transformation, but the additional yellow bricks fill in the hood as well as making the tailgate a little more solid.
Little adjustments here and there? That's sounds like me. It usually takes me a while until I'm satisfied with shape and angles, and I build and demolish and rebuild 'til I'm satisfied or bored enough to quit and come back later.