I'm not sure, I'm no min maxer. I just like to keep busy. I kill almost every zombie I see, loot every trash bag then I chop up the sack for paper/plastic (if being a shotgun build), I mine at night, keep building. I think building is a really fast way to level, but only after you've got some perks so you can get a lot of mats. I keep working on my base and add on a bit every week or two. Stop, adding on and get that upgraded, etc. Once I get a motorized vehicle I start harvesting cars for fuel and parts I'll need for vault doors and traps. Leveling up means zombies get harder too, so I don't really try to power level, but I don't mind leveling up either because I get perks.
Table saw is no longer a thing, you can find them in POIs but they are just a decoration you can harvest for some parts, no longer a workstation. No new shapes nor paint afaik, but lots of textures have been upgraded.