I'm considering how to do the round corners, they must be round.
I could probably bend the acrylic with a large heatgun, problem is just that I don't have a heatgun, so now I need to decide if I should buy one, might not work
Anyway, I do have another idea, will take a bit more work, but it should be doable, I have some 50mm plastic pipe (here one cut in half)
I could cut it in quarters and glue it together with the acrylic. I'll need to do some tests to see if that would work. Not sure if I can get a good enough bond between the plastic and the acrylic.