So, playing a ton of hours since release I love the mod, its great, exactly what was needed for 7D.
I have some thoughts with the construction system.
It's better to take over an existing POI and add a bit of reinforcement than construct your own base especially at the start/early game.
The resources required to make a basic 100 block structure is 1000 wood, 100 pitch not taking into account the room for decor/etc which requires even more room to all put down that doesn't look like a slop.
Thats a cramped enclosure which is minmaxed with some decor, breaks very quick with the amount of zombies roaming about and spawning while dealing with 250hp walls.
upgrade that to the next level for 500HP, 1000 wood 200 nails. Nail's aren't that hard to find since you can break all sorts of things. Your base will be still ultra cramped and you'll need to expand, tear down, make a perimeter, etc...
It's better, more efficient and less time consuming to take over a POI that most likely has a 1000HP+ base blocks to begin with and you can just put spikes down to stop randoms at entry points. It just discourages base building with the effort it takes to make blocks early on.
This is what I suggest, ease the requirements for especially the earlier blocks.
Joined Wood (250 HP): 5x Wood, x3 Plant Fiber
Nailed wood (500HP): 7-8x Wood, x1 Nail
Cobblestone (1000HP): 7-8x Stone, 1x Mortar
Beyond Cobblestone of course I don't have any opinion on since its more late mid/late game stuff. Haven't thought about it too much.
At least it would promote more people getting their own bases going instead of taking over POI's. the building/tool system is interesting I do like it but as is its just not that fun with how steep the requirements are to build a base with the whole decor/vit function in game. I mean you can slosh decor around just for the bonuses but its going to look like shit without ample room, It's just a cramped space with stuff strewn around which isn't very homey.

but nice idea