Finally finished the interior off. Instead of cutting the driver off, I just cut some holes in the card and sent him through from the bottom. Got him glued in place and stuck the assembly into the body.
Lucky for me, I then extruded out some string for the body mounts so that my #2 screws would have something to grab.
Then it was off to the track.
Darn, it was a little light in the front so I need to add some pans to hold weight in front of the flag. Since I'll be redoing that I might as well give the flag a little more room to swing so it will hang the rear out more without jumping the slots. Oh well, another lesson learned with 3d printing.