thanks joe, I got the porter fabric wednesday. However, it's 60" wide.
So you used 12' circum for a 100" circum 30+30+20+20, and I believe coffer used a 90" circ. for a 34" wide box. That's what confuses me. I guess I can't mess up using more....
Thanks also about the tip of bottom versus top, hadn't thought of that one.

How high did you end up putting the 'table'? around waist height?