|Looking really good!!! A metal file might help to clean up the edges. A belt sander can also help clean up edges.
My only other advice is that you 'might' want to place 1 or two crossbars from one side to the other to keep each side from bowing outward or inward. That would help to stabilize the framework, and it would also take some of the stress off of the frame 'legs' and truck bolt assemblies.
I love how good you are at making things. Good work!