Does anyone here have experience with building using shell walls? I'm wondering whether it's structurally feasible to construct the wall framework with the shell technique according to my idea, which is to use 95-studs for the facade layer and inner layer with a gap in between. So, stud+MU, only MU, stud+MU. This allows room for about 300mm of wall insulation. For the house, I'm considering FTX and exhaust air-water with underfloor heating. Could such a solution be cost-effective?