Only thing I'll add is that I too used SCH80 for the cool grey look, but it was really a waste. Both in $$ and time spent sourcing things. Not to mention the slight flow impact of the narrower inside diameter. If I had it to do over I'd just go as pure white SCH40 as possible and maybe spray paint what could be seen outside the stand.
Im glad you mentioned this. It was on my to do list as far as doing some more homework. I never knew there were draw backs to using sch80. Is the flow impacted a lot? What do you mean by sourcing things? Do you mean finding sch80 parts locally?