You bet, that's the kind of stuff I think this roller was made for. Most of the commercial rollers like the one that was scratch made have the dies on the front of the frame. This is so if you are making rings, it's easy to just loosen the adjuster and you ar free of the machine. But if you are making gentle curves like what it sounds like you are making, this is the way to go. I can't remember if the original square dies were for 3/4".... But you have to make all the dies grooves line up when you machine them bigger, or it will make your material twist when you roll it. But if the dies are done right and in line which each other it actually comes out nice.
When you do round tube the expensive machines have guide rolls to help keep the tubing straight while you roll it back and forth. But with square tube it wants to stay straight. So do you have a lathe to widen the grooves in the dies to fit your material?
Being the low budget lo tech kinda guy I am, I'd lay out on the ground or floor the radius you want to form. And the first piece of material roll it gradually until when you lay it by your mark it fits perfectly. You don't want too big of a piece because they get really hard to handle as you roll them. Mount it solid but you don't want it too high and can't mount on the ground because of the big hand wheel. I put mark on the big screw/bolt that you tighten on top so you can keep try to make each piece the same. Or a piece of hose over the treads. If I could find the right thread I'd put a nut on it to stop in the same place. Remember too that you are going to have "dead spots" or straight spots on both ends of the pieces because it can't roll all the way to the end. I don't know if that's a big deal to you or not, but if you want all nice curves you'll have to cut off those ends.
If I was going to use it a lot I migh rig up my HFT power unit(power threader) but I thought it fed back and forth ok.
Hope this helps, and good luck.

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