|
I'd go with the channel for ease of construction. Otherwise you will have to fabricate end pieces for the tubes.
Another alternative would be to use square section tube and mill off three sides where attachments are required. That could also use thinner wall and thus reduce weight as the tube would be more robust than an open faced channel. With a bit of redesign you would not have to mill the ends either. I built another project and used tubular inserts inside the box section to strengthen the joining elements so they didn't crush the tube when tightened.
|