I will finish the rest later I just had to get the front done so i could start my cabinet.
Installed the Propex heater,

This is bottom side
I used cheap Sink drains to go through the floor with the intake and exhaust.
I used this Stainless steal sink drain to run the exhaust through the wall below the floor. It was going to cost me over $120 to get a "Through haul adapter" from a marine place that sells the Propex stuff and this cost me $12.
On the front I removed the plastic battery vent and put in the Dodge fuel door. Took some creativity to make it seal but it works well. This i will use as a power and water access door.
Front mount is a temp ply wood job but it worked well for the first trip. The wood will make a good template for the metal work.