I intended to use the control room as a writing room for my self as well as for mixing and recording. On the other hand the live room will be used mainly for recording a grand piano, strings vocals and the other stuff occasionally. I will consider having an iso booth given that it doesn't constrain me from having a grand piano in the live room since this is what I intend to record 40% of the time. (My partner is a full time pianist).
Regarding the structure:
The building is made stone: with concrete reinforced floors.
If you need further details please do ask me

Any suggestions are welcome...