Evening: I appreciate all the replies on this, and it has helped me make some cetter decisions. My workbench if you will, will be laid out in an "L" shape against2 walls. each section measuring 36" inches wide, by 72" long. Made of 5/8 mdf on 2 cafeteria style folding tables. I am thinking of laying approximately 2 inches of foam board on top and going from there. I have been in a quandry trying to decide to lay green carpet orthe fake rolls of grass directly on the board, but have figured out doesnt give me the flexibility of contouring. So thanks guys. by using the foam and being able to paint several brown and tan base colors, then using the shaker gras and foliage ican produce a better look at cheaper cost,bottom line and on budget is it in any construction have patience with me, i'm learning , and you guys are my "WORLD BOOK ENCYCLOPEDIAS"