I bought 46 White Lego Bricks, 2 x 4 (part 3001) from Bricklink.com for $.195 each ($8.78 plus shipping)
For the spacing, I came in 1/2" from the side, and used 4" spacing from the left side of each brick. The bottom of the bricks on the top row are 3" below the top of the Lack, and I used the same vertical spacing. This gives me 42 "shelves" to display Lego Minifigs. (I bought extra bricks in case of a mixup with the epoxy--which I did have!).
I used a level and painters tape to make sure my lines were straight, and I made marks on the painters tape to indicate where the bricks would line up
I used JB Weld 2 Part Epoxy to affix the bricks to the table top. I placed the bricks quickly, and pulled up the tape as I went, so I didn't have any blue painters tape permanently affixed to the table top.