[bobbysq]

If you have long metal extrusion you want cut down, get a horizontal bandsaw. You can put a tube in the vice, walk away*, and wait for a loud clanging sound from across the room. In addition, you'll probably want a drill press for making holes in said tubes once you're done with them.

I would also recommend a 3D printer for making custom parts. It's good for various custom mounts and spacers. You can also print out items that are hard to get (a few teams printed pneumatic wheel hubs this year, no idea how that turned out) or ones you just can't bother to wait for. (AM's battery mount is easily printable, and the total filament cost will be a bit less than $14)

*Note: for safety reasons, you probably should watch your bandsaw while it's cutting.