I started the process of converting a 2014 Ram Promaster 159" (3500 EcoDiesel engine) into a tiny home. I bought the van used with 46k miles on it.

Definitely some signs of wear and tear, but overall in good condition & a good price given the diesel engine. The dealership I bought from, First Ford in Fall River, was exceptionally difficult to work with.

After scrubbing the interior, I installed Rattletrap and furring strips. Rattletrap is a sound deadener, it's the silver stuff plastered all over the walls & ceiling. I had 50 square feet total, which I cut into a bunch of 6x18" strips for the walls, and 2x18" strips for the ceiling. The furring strips (horizontal pieces of wood) are intended to make the sides flush with the frame of the van. This will make installing walls easier.

I installed the first half of the subfloor. The subfloor comprises 3 parts: 1/2" plywood boards, 1/2" polyiso insulation, 1/4" plywood strips (in that order, from top to bottom).

The 1/4" plywood strips are intended to make the floor flush, so that the insulation doesn't bend/compress as people walk on it.

I finished the second half of the subfloor. It took a little while to cut out the wheel wells and get the pieces to fit seamlessly.

I took a bunch of measurements to determine the interior layout for the driver's side wall. A queen bed will extend to the left of the image, drivers seat to the right. There will be a table in front of the bench seat.

I also outlined what the wiring will look like. Diamonds denote fuses; heavy borders are energy sources. I used the app Monodraw to do this. I'm not sure if this is right, but it's what I came up with after watching a bunch of YouTube videos.

I also placed a big Amazon order. I bought everything in the wiring diagram, aside from the wires.