A Dremel is probably the most useful tool you will ever own. I don't know how I ever got along without one. Cuts, shapes, sands. Once you use one you will know why it is good to have.
I think Lowes has them on sale this week?
Not mentioned is a building board. You want a base that is absolutely as flat as possible. I use a 6' by 2' hollow core, bi-fold door I got on closeout at my local hardware store. On top of your base you will need something that you can stick pins into to hold your parts in place. I use 1" Dowboard (sheet foam insulation, $13 for a 4'x8' sheet and can be used over and over) Some people use ceiling tiles but I never liked them to build on.