I used Ash wood from my local woodworking shop. The wood varied in width but is a true 2" thick. The table is 12' long and 4.5' wide. I didn't see the need in having the X on the leg ends as the ash was plenty strong enough to hold the top planks. Plus, I really like the look without it. I did add a cantilever beam in the center to stop sag. I didn't feel like I needed diagonal bracing in the center to support the cantilever beam (Note: Original design has center diagonal supports in wrong direction which do nothing for structural integrity of table). The table top planks were strong enough to span an 8' distance. The table top over hangs each end by 2' on center. I left the wood as rough cut as possible. I did rough it up a little more. I sanded with a #36 grit only to sand off writing, dirt, and burrs. I stained with MinWax Early American and sealed with Satin Poly by MinWax. Feel free to ask any questions. This is my 2nd wood project and I am hooked.
MinWax Satin Poly