I have finally finished my wood racks. The two board racks have 5 levels. One is 8'x3' and the other is 10'x3'. The sheet rack is 4' wide. All are welded steel (I know blasphemy!). However, each rack is on wheels and capable of supporting up to 4500 lb.
The teenager in the picture is my neighbor's son - agreed to teach him how to weld.