Found some woodland which hasn't been visited by anyone in years. Completely overgrown by brambles. Land is owned by some large international owned oil company who owns lots of land around here and don't do anything with it.

I've cleared out a square patch of brambles and I'm going to build a cabin out of pallets. Layed down some concrete blocks (I can only transport 7 at a time as I have a small car). Found a local dude who can sell me 80 pallets cheap.

Gonna put a membrane in-between the pallets and the blocks.

How do I level out the ground? I have a spade and string.

Also any additional advice is most appreciated. First time doing something like this.