[DonRotolo]

Properly set up for use on a multi-person shop, I'd want no smaller than 15 x 25 feet or so, but this can be a little smaller or a lot larger.

In addition to the belt/disk sander combo (I like the 9"/6x48" Harbor Freight unit) I would include a basic 8" table saw; great for cutting sheet goods. This machine needs a lot of free space around it, so get one with wheels and store it in a corner, pulling it out as necessary. A 10" saw can cut thicker material. No need for a $1000 machine, a 'portable contractor's saw" for half that will be more than adequate.

George: Again, thank you for the effort, I am sure that several teams will benefit.

Edit: The NASA machine shops use 8' x 25' or so, but that's not what I'd call a "proper" set up, particularly for HS kids just learning the machines. For a one-man shop, it can be a LOT smaller though.