It is slightly bent, any ideas how to panelbeat it straight?.. would be appreciated.

I was going to use a 48 tooth single chainring for a road bike 700c wheels 8 speed nexus 15 sprocket, but i'm guessing it would be way too tall

this was on the frame i'm using when i got it, have the matching peddle arm for the other side, i quite like the look of it.. so would like to use it for that reason as well, it's 42 teeth