@MELGAR posted:Peter,
I recommend additional lower bracing (left to right in these two photos). Mianne doesn't suggest this but I think it makes the table more sturdy and rigid. I have included it on both my layouts. You can see what I mean in this photograph of my 10'-by-5' layout table. Just a suggestion and my personal preference...
MELGAR
The wheels are a great idea too. I have them on my 6 x 20 and had to change out light bulbs last weekend and didn't have to climb on the table. The extra braces make it more sturdy if you have to move it with all the weight the layout will add. Great start either way.