Wow! Thanks alot everyone!
MrJG:
Those are actually "Powermen" brand pipes off the 'Bay. $45 ish shipped. The Cal Aqua intake is too long to fit in/on a 20L, so I bought an ADA 60P to put them on

I've got 5/8" x 1/2" barbed nylon reducers on the XP1 tubing. Haven't had the filter running yet, but the 1/2" id tubing from Home Deep seems to fit pretty well -- not too tight, not too loose -- it's some work to get it off. They're kind of thinner than I expected, but don't seem overly fragile. Same deal with the CalAquas -- a bit thinner than I expected.
I did make the stand, and will try to post pics tomorow...
Plants are to be:
HC (of course!)

Dwarf Hairgrass
Blyxa Japonica
Anubias Petite
Anubias Nana
Green Crypts (maybe... on order, but not sure yet)
Ludwigia Arcuata
Thanks again !!!