Dremel rules in model building. I have 3, two cordless and 1 cord.

Here are the photos of the wing showing how the flap servos are installed. Notice both arms exit from the same side, unlike the ailerons.

I also show how I lay out for the engine cutout in the cowl. I use the paper method for all the openings and once I have a rough cut and see how it all fits, smooth out the edges.

Dremel sanding drums in different sizes work great.

Jim