The last work bench I built was about 2 years ago and the top was made with a 18"x16'x 3-1/8" laminated beam with out the crown (which I ordered at the local lumber yard for about $155.00) These work great for work bench tops cause there is only one glue line in the middle. The top I built finished about 35"w x 94"L and cut my square dog holes with a 3/4" mortise bit. My dogs were then made out of 5/4" Ipe for strength.