Slow progress on this build over the winter/spring but things have picked up recently.
Lower chamber after the walls were completed
Interim lighting solution
Wheelchair access under construction
Elite construction crew pondering their next move
Pouring the intermediate slab : 53 tonnes of waterproof concrete. The concrete I'm using has nearly six times the compressive strength of standard concrete blocks (tensile strength is provided by the rebar).
After this pour the biological material could be removed from the lower chamber; all of it went back into bracing up the ramp area.
The main door is 5m wide with 2.3m headroom
Fire escape hatch; the main risk is vehicles catching fire in the upper chamber, as there is no wood and minimal plastic used in the building.
The roof over part of the ramp forms a workbench, 3.4m wide x 1.2m deep x 0.9m worktop height (concrete to be poured tomorrow).
There is a greyhound-sized sink and area for washing machine and dryer built into the concrete structure. These minature concrete walls and slabs use galvanised weld-mesh for reinforcement.
The door into solid chalk is not only to confuse building inspectors, it will allow for an underground connection to the main house to be added later.
I told my wife that this apperture is for a future utility duct but it's actually the lower entrance to a Jefferies tube & escape tunnel.
Upgraded to a more useful work lighting solution.
I've gone with an Optoma laser projector, 2 x Quad ESL2912 electrostatic main speakers + 2 x Silberstatic electostatic centre speakers (vertically split phantom centre) + 4 x Magnepan MG7 surround speakers (ceiling speakers TBD). This rig was to test the phantom centre setup.
![Image](https://image.ibb.co/f712yJ/screen_test_rig.jpg)