My original plan was to laminate some 2x6s into legs for my workbench. I already have the 2x6 material but the big blue store currently has some pretty clear/straight looking 4x4s in Douglas fir. Is there any benefit to the slightly bigger leg dimensions of 2x6s or would 4x4s be adequate? Per Paul sellers’ plans each pair of legs would have to mortise and tenoned cross braces. Thoughts?