First step accomplished today; Installed an RV style side door latch. Thanks to Kickintail for the idea and the support through IM.
$30 for a latch on Flea-Bay was a way better option than $300 for a new door.

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And here is the interior as it sits now. Just finished insulating and painting the walls.
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Next weekends project, the wall mounted/fold up queen size bed and simple electrical system to keep me powered at the race track. Stay tuned for more updates and pics. This is gona be FUN!!!