the inside wall will have as it shows 2 layers of 1/4" luan and the outside of the pool will have one skin of luan. The floor joyces are on 16" centers and will have blocking and will be blocked up from the floor as not to have any sagging.The floor will be 1 layer of 3/4" and 1 layer of 1/2" on top as to cover the 1st layers seams. The water depth will be max of 22" which will give me 850 gallons but will keep it more like 18-20" which will give me in the high 700 gallon range if I remember right. I will paint it first before i put in the 30 mill blue fish safe pon liner. Wanted to get a custom liner made but I felt it was'nt worth the 350.00 dollars so I will just buy the sheet piece and drop it in and deal with the wrinkles which wont hurt a thing.