DW Trike Gear Train

After I cut the axle into two parts ...
I removed one side and attached the free-wheel
gear cluster and adapter ... and 4" pulley.
Just trying the chain on for size ...
and I need to weld closed all those open ends ...

The 4 rear frames ends and the end of the main tube are welded closed.
I put the other axle and wheel back on ...
and welded a rear axle to the frame to use as a dérailleur hanger.
Still need to run a cable so it will shift ... put on a chain roller ...
AND ... brakes.
I did go ride it down the street just to verify it works ...