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When deciding about column height, I considered couple of things:
- Closing the roof without damaging the equipment,
- Is it worth to go to the horizon, given the LP at low altitudes?.
I used two blocks per layer for the whole thing, but you can use 4 blocks (with middle cavity) for lower part, this will give you more stability and overall strength (provided it is really needed.. people tend to overdo those things, generally speaking) so you can go higher.
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