[JVN]

Looks good!

Are those side "pontoons" each one large piece? If so, the sheet-metal bending may be touch to accomplish. It is tricky to get a die into such a tall "U" section. If these do get bent, you may find it is a struggle keep bearing holes aligned axially between the inside/outside of these U's.

The belly pan lightening pattern isn't very efficient. Is this being laser cut? Turret punched? You can potentially save a lot more weight out of it -- either by moving to a more "traditional" truss pattern, or just adding additional holes and/or smaller holes within your current pattern.

I'm always a big fan of the front/back angles.

How tall is the frame? Depending on wheel/gearbox config, it looks like you could tighten it up a bit.

Good start -- keep iterating! Each one will get better.