Yes it’s 4 inches. I was going to try the linseed oil. What would you recommend?

@Sir Cobalot thanks for that tip!

Six pallets long and 3 pallets wide. Around 11/22 ish

I agree on the insulation. I’m going to stuff the pallets then add them to the top. I was thinking of making concrete frames to pour under the pallets or making it with rock and mortar. I have a lot of rock of all sizes available.

Also I was thinking of framing the bottom from the outside and filling it in when I do the earthen floor. Adding boards under the pallets now would be challenging.