Thanks. All the post on here provide plenty of motivation!
After cutting the rear hatch opening I needed to reinforce the back. This piece was a semi structural 5/8" board since they didn't have what I had used everywhere else. I'm using 3/4" Coosa Board strips to reinforce it and provide a stop for the center hinged hatch.
These are the equipment pads that I'll glass over to mount the fuel filter, raw water pump, sump pump and two thru hulls for the seacock and transducer. I've simulated working on these and should be able to install and remove without too much trouble.