To change the subject, I used PVC sprinkler pipe to mock-up the roll bar, and at less than $2 per 10' length, plus a couple of 90-degree bends and a couple of connectors, I have very little into the project, and saved quite a bit of time and money over "just building" it. The way I figure it, 1.75" x .095" wall tubing is lighter than 1.5" x .120". 1 1/4" (I.D.) PVC is barely under 1 3/4" outside diameter for anyone thinking of something similar. I tried gluing the pieces together, but other than the main hoop, it didn't work. I ended up drilling 1/4" holes in the two pieces being joined and using a long cable tie through the holes. Pulled tight, it holds just fine.
