The OP already has her answers.
NOW we are indulging in personal stuff.
As you can see I have nothing against tarps, if used in the correct environment.
But thank you for you non contribution , once again.
You do that rather well.

You are correct however about the 'kite" comment.
More like an umbrella actually.
I have been playing around with the pentagonal shape for a while and in fact Henry made a working version of one of the designs last year. (one day it may appear...)
Recently there has been a lot of interest in a DIY version of a certain popular shelter so I made my own .
Similar structure but a different way of building it, different proportions.
The main aim was to make it very simple to replicate/build , and it is...
But, if I intended to use that, I would put at least a pressure release vent that can pop open if there is enough pressure build up.
Do keep in mind that (incredibly enough) none of the people that use this shaped shelter have any intention to put a chimney inside it.
Their loss I suppose.

Franco