The pali to brick upgrade sounds a bit unreal. But what about an upgraded first tier of fortifications?
For rammed earth for example (
https://en.wikipedia.org/wiki/Rammed_earth ) the palisade could act as the framework. Upgrade could cost 25% bricks, 25% dirt, 50% clay. You could only upgrade segments between cornerposts with them included, and the soak would be the same as the palisade.
This would be a close to the max tier for your average hermit, as most don't even plan more than palisades. The hardness shouldn't be even close to the brickwall, let's just say it would just double the time and effort to pickaxe through it.
Last edited by momosan on Wed Sep 16, 2015 10:35 am, edited 2 times in total.