I have have ended up using a vintage 3/8" bender I bought on eBay. It is shit for 3/8" but great for 10mm ERW.
I use ERW mild steel for smaller platforms and anything bend and T45 for the struts/supports. I would use 4130 or T45 for everything but that would require a better bender.
It’s probably around 10mm erw that I have and I have one of those benders with 3 channels for different size tubes so will give it a go. I can get that erw stuff for buttons so if I mess up a couple bends it’s not the end of the world.
I have had issues with a really good one costs ££
I have have ended up using a vintage 3/8" bender I bought on eBay. It is shit for 3/8" but great for 10mm ERW.
I use ERW mild steel for smaller platforms and anything bend and T45 for the struts/supports. I would use 4130 or T45 for everything but that would require a better bender.