The 2v 'pod' structure
This is essentially a 2v with another layer that goes straight-down which means you get good head space in a neat footprint.
You need 32 extra sticks on top of the regular 2v:
1x Door Short (0.466x diameter)
1x Door Long (0.422x diameter)
We suggest creating the extra height with 20x Shorts.
This means that the height is made of isosceles triangles (these make up the majority of the dome already). Then you use another 10x Longs for the new base which is the same diameter as the base dome, just off-set by half a Long.
We recommend 3.2m as a max size, if you go much bigger it becomes a bit unwieldy and harder to build and the height becomes too high for the diameter.
Parts required for the 3.2m pod:
45x Longs @ 900mm
50x Shorts @ 786mm
1x Door Long @ 1491mm
1x Door Short @ 1350mm
30x 6-way hubs with all parts
6x 5-way hubs with all parts
This is just a regular 2v kit + 10x additional 6-way hubs with all parts. If you already have a 2v kit the upgrade pack of hubs is here.
It's a good size for a garden room, greenhouse, fruit cage, self-contained treatment pod, or perhaps an outdoor space for schools.