Baroque Peastant Hut
Rego craft magics require materials upon which to cast. In this case, the requirement is quarried and cut stone which can be assembled into a hut. You can't manufacture this without having the requisite materials.
So, let's go through the components, you have control or move rock in a slightly unnatural fashion (Base 3) I'd say it's Base 4, control or move rock in a very unnatural fashion. Having stones assemble themselves into a house. +1 touch, that's fine. +3 structure is wrong though. It's not a structure that you're affecting, you're assembling one. It is a Group of stones. A group has a mass of 10 standard individuals. A group +1 100 and a group +2 1000. How many stones are necessary? I dunno. Let's go with group +1. We'll ignore the size, because the size of the individual elements can be presumed to be a stone no greater than 1 cubic pace in size, and is likely smaller.
So, I still get to ReTe 25: Base 4, +1 Touch, D:Mom, +2 Group (of 100 individual stones)
But the killer is finesse. How long does it take to build a stone house?
I'd say a season. I'd say it's between easy and average for a stonemason to do this. We'll go with easy for this run through. So, the necessary finesse roll is 6+3+6=15. Anything short of that means a dangerous house.