Well, to do it right it takes a bunch of tools!!! To start your list you'll need an air shear, left, right, and straight sheet metal shears, cleco set, quality hammers and dollies, and a flanging tool. Too do a really nice job, you could add a bead roller, slip roller, and then it would be on to the expensive stuff!!!! You should have a local source for sheet metal, you'll probably use 20ga, I buy mine in 4' X 10' sheets---so you either buy that locally or pay exorbitant freight rates to get it trucked in.

Fabbing up an entire floor and a set of mini tubs isn't that tough a deal for an experienced sheet metal worker, but are you sure you would want to tackle something like this for your first project???