Scout car build questions

[OPARENNEN]

But I saw no way to "lift" the blade to allow me to do the cut for the pocket in front of the rear axle. How do you do it?

I do it just like ODD. I drill a small hole somewhere in front of the rear axle. My scroll saw has a quick disconnect for the blade, so I disconnect the blade at the top, feed it through the hole in the body, and reconnect. I can do all of this in under 60 seconds and be ready to cut a weight pocket in front of the rear axle

This is exactly what I do. Got mine at Home Depot. Current price $119 (skill) and $99 Ryobi (MINE).
Both work as Regal explained.

Another method is on 5kids site. Done that also, but like the saw better.