Well, seeing that I'm building it for Barton, and that it isn't here... your guess is as good as mine! Maybe a month or two.
I'm building this thing on the weekends, and since life is pretty busy here, I get maybe one half day, every other weekend. I do however have a lot more time to think about it!
Yesterday, I realized I made a measurement fault, so I've got to cut another piece of tube, for the part between the screw/barb cap, and the clear flexible elbow.
Lucky for me, I've got 4 feet of the stuff...
I've also started to look into the hardware needed for the mount. I'll go with the idea Utabintarbo had, which is a set of outriggers. Screws have to be 6-32, since the (new) hole size is now 0.150 inch. Once I've figured out which springs to use, I can spec the screw, and place my order with McMaster.
Right now, I still need to figure out which epoxy to use for polypropylene (the 1 1/2 barb and tube connection), since the plastic welder is useless.