This is the first I've heard about the 80:20 / IPS material. But, if you're having trouble with that stuff, my team used BOSCH / Airline Hydraulics materail last year to make our cart and this year for our pit. It looks remarkably similar to 80:20 - it carries a 30x30mm line, a 45, 90 and bigger - and it comes in rectangular (eg 45x90) pieces too.
I almost gave up on searching for a link, but I found it almost by accident
Here it is. It seems that online ordering is available there and it looks like they have CAD diagrams up for everything - oh and their "FAST" delivery means overnight
