I propose a layout that provides the least cost to moving in. If walls and electricity changes will cost time and money, I propose we move to this layout first, make our changes, then find our final layout.
This layout (possibly with one of the current workshop plastic sheets to separate the small room in the back) would provide dust separation by default, power requirements by default.
The welding area is separated in a room not suitable for welding, but in earnest, we probably have no chance of having any place suitable for welding on day1. Unless we are welding outside, there won’t be anywhere with suitable fume extraction or a welding table.