How to Make Your Own Arbor Trolley (Stein Brand)

Materials List (approximate):
1"x 2" square tubing (4 @ 20")
3/4" x 1-3/4" solid square (4 @ 3")
2-1/4" x 2-1/4" square tubing (1 @ 30", 2 @ 12")
2" x 2" square tubing (1 @ 48", 1 @ 26")
18" foam core wheels (2)
3/4" solid round (1 @ 36", 4 @ 24", 1 @ 16")
3/4" x 3/4" square tubing (2 @ 12", 4 @ 24")