I wish I had posted this before I ruined a day building that tank (I also built one a few weeks ago for another sport plane and it was hell too).
THANKS for some great ideas on the various problems with these things.
I have gotten fairly good with tube bending (using a braided cable inside and the spring thing outside) but it is really hard to control the bends as to exact location and radius. Usually they look a little kinked and that offends me too. I will try some of the other bending ideas and maybe even try copper tubing.
The ideas for lubricating the tubes for inserting will help a lot! My old hands keep me awake at night as it is, and forcing the tubes through the stopper is brutal.
I will look at the Hayes and Dubro tanks with a fresh eye. I usually want a three line system but there are ways.
I saved out MinnFlyers great article because it is so clear and informative. It also shows ways of doing the installation with less tube bending, particularly on the fill and clunk lines – assuming I drop the idea of the “slant” tanks (which just force the necessity for more tube bending than the end cap type).
I heard that the Slec tanks may be available through Hobby Lobby so I will order one to see what it is. Also I will check out the assembled tanks at Horizon.

Again, many thanks to you all.