The lower floor is pretty easy. 3 pieces one small piece under the front seat, one large main piece from front to back, then there is a piece from the main floor to the door enterance. There is extra frame support where the pieces join together. All the lower floor joints and edges need to be sealed to the frame with adhesive calking.
The upper floor is four pieces, front goucho area. Lines up with drop floor from side to side. The rear dance floor, lines up with the drop floor across to each wheel well and it fills in to the rear wall. Section 3 is under the kitchen area from the rear drop floor to the front drop floor, you have to cut around the wheel well and this piece overhangs the lower floor. There is a little piece of wood in the bottom of the closet but no overhang on the closet side. The upper floors need to be sealed to the frame around drop floor.
I use 5/8" exterior plywood with the road side sealed with resin. Attach the floor to the frame with wood to metal counter sunk big head screws.
No standard patterns, you have to make your own templates. I use lauan and tabs of cardboard to make my patterns.
I found it is best to replace the upper floor one section at a time. Also make sure your door frame is lined up before glassing the floor to the door frame.