Or you can do what I did and get the door core and put it on a pair of those plastic collapsable saw horses. They take up hardly any room and are stable for the door to act as a building platform. Put a piece of plastic "drop cloth" on the floor to catch any drippings from glue, fuel, whatever, and go for it.

I bought some 3/8" cork sheeting and glued it to cover my door core so I could pin plans to it. Keeps things light and you have a work surface that is solid and large enough to build on that you can pin plans to. What else do you need!!