not sure I like the sound of Ventricle (SIC) walls!! Sounds like a stake to the heart.
If you bought extra starplates you could go out from the bottom then back in again but you may need to add height to your pier!
I think the 3 metre studs would be the best- I doubt anyone from Council could work out you'd overstepped the mark! Making a building 5 sided has its compensations.
if you put in the apex plate, fit the rafters, then put perlins in, you can cut away the excess neatly and have a pop out apex for zenith tracking
A double ring plate could be fabricated from laminated 18mm ply and the rest is history as you say
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