hey joshua!
the durso is made from 1" pvc, i didn't know anything about making it larger, the original downtube was 1", so i used that size to built it from. the black eggcrate i got from regal plastics, it about $30 a sheet, last time i checked they had 3 sheets remaining in stock, i was able to make mine from 1 sheet. the pvc that runs underneath and around the bottm is made from 5/8" pvc.
thanks for the comments, it makes it all worth while!
peace!
mike