Electric drill with driver bit for screws

Set of drill bits with:
3/32" bit
1/8" bit
3/8" bit

1/2" to 3/4" paddle bit

Shears for cutting metal

Miter saw

Staple gun with 1/2" long staples +

Tape measure

Clamps

Carpenter square (and tri-square)

Bolts with washers and wingnut

1/4 X 3 1/2 (for side panels)
1/4 X 4 (for top panels)
1/4 X 5 (for added spacers)

Screws (coarse thread drywall)

Bundle of lathe board (for trim) 'cuase it's cheap.

Wire or plastic mesh with 1" opening. (depending on size of animal)

Hinges (2" w X 3" h)
4 per door minimum

2 X 2 X 8 (staight as possible)
(15 pcs = 1 basic enclosure 3 x 3 x 6)
1 top and 4 sides including door

Sheets of plywood, osb board, plexiglass, or other materials you choose to use as a solid backing for your side and top frames.

1 1/4 in (lathe/trim)
2 1/2 in (frame supports)
3 in (frame assembly)