OK some new photos
This first shows the new storage space between the sauna on the right and outer wall on the left (it comes more out but could not fit to take wider picture).
The space above the horizontal beams (all the way to the sauna wall) is roughly two meters wide, one meter high and three and half meters long.
Behind that shiny wall would be another three meters of space but didn't have enough insulation sheets (takes two weeks to order) nor brother and father time or will to do it currently (I being just too big to properly move there and astma doesn't like the dust).
Under the horizontal beams would be somewhat unobstructed (some beams bit on the way but they might be movable) and fully cubic space of two meters by one meter by six and half meters... but it's full of insulation wool (not sheets but free fluff) and sawdust, about 10 cubic meters (or 353 cubicfeet).
Might take that (and the other extension space mentioned) into use next year (or sooner if I get good offer from suction truck to come andd get it away).
There will be insulation between the beams as currently outside air gets here from various spots.
Also ceiling is missing thing insulation sheet layer.
Then walls, floor and ceiling will be covered with film plywood.
