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At least @Laurie Booth didn't have to play dress up as a pilot for his photo.

Insulation: Kingspan. Much easier than spray foam in a not new boat. Fill any gaps with gun grade canned foam and tape joins with ally tape. Insulate everything, including the water tank. Floor: 18mm WBP good one side plywood on treated timber battens. Draw your planned layout full size on the floor before you fix it down. Leave a lot of access hatches where you will be able to get at them. Ensure one is right at the back of the living space. Plan your cable routes before you start. You will need surprisingly large cables, to prevent excess voltage drop. Especially to a compressor fridge. Allow space to add more cables. Forget flexible solar panels. There is a reason they only have a 1 year warranty. Rigid ones usually a 25 year warranty. Try to install stuff like water pumps and accumulates where you can get at them Remember you need to get a BSS certificate for a licence, so read the requirements carefully, and understand the examiners checking list in detail. Do not do anything novel without getting advice from the examiner you intend to use. Buy the best tools you can afford. Expect the fit out to take 4 times and long, and cost twice as much as you hoped. Good Luck. Fitting out is great fun. N