I will build an interior wall using 120 mm leca blocks, the wall is non-load-bearing but serves as a support wall for the outer wall. Now, I have a distribution cabinet (underfloor heating) that needs to be built into the wall, the cabinet is in place so I will have to build around it. My idea is, as mentioned, to build around it; on the backside, I will insert an aquaroc (cement board) into the leca, mesh, and plaster it. The reason I chose aquaroc is that it is strong and plasterable. Is this possible, or will I encounter problems with movement and cracks? I will have 13mm clearance on the backside of the aquaroc board and the distribution, I can insert a spacer to support the board in the middle.
It should be fine, I haven't done anything like this before so that's why I have my questions.