Thanks for offering to check, Dave. I contacted Chabot ATM, they didn't have any but suggested some sources. I ended up ordering the 12' sonotube from Dale Hardware. I have all the parts for the scope (8" f7.25) and am in a bit of a rush to finish it for the Stars Over Yosemite party the end of August. I realized I couldn't pack both my 20" and my family to Glacier Point, so I had to choose...the family of course...so needed a smaller scope. I might not be able to paint it in time, so it will be an interesting conversation piece.
Heck with the extra 6' of tube I can build another scope... might as well!