In response to your PM:
> 1. Purchased heavy duty main pole (larger diameter & heavier tube walls)
This is definitely stronger, but you knew that. Probably now essential.
> 2. Sewed Velcro cable wraps inside the fly to the exterior reinforcements for the
> crossing pole straps. These hold the crossing poles in place & prevent fly flapping.
Just checking: the diagonals no longer go to the ground but to eyelets at the top of the CF corner poles? Assuming that is so ...
The tent can now sway a bit because the diagonal poles no longer hit the ground. The guys at the ends of the poles will stop some movement, but sideways movement would still be possible with single guys. If you put 2 guys at each corner, at right angles to each other, that would stop most of the sway - at the cost of a little bit more string and some extra stakes. Could be worth while.
The Velcro loops are extremely important imho. Without them the fly would collapse in a wind as the diagonal poles would go sideways fast. Whether there is enough Velcro there, or whether wider velcro would be better - time will tell. I would always do them up, every time.
The only thing holding the diagonal poles up is the main exterior pole. The CF corner poles will not support the diagonals that way very well. (I couldn't see them, but you mentioned them, so I am assuming they are there.) The strap coming down from the peak looks solid enough - webbing and a metal hook? So the main exterior pole is pretty crucial.
I think the CF corner poles are going to be essential as well. They need to be 'embedded'.
I can't see any guys on the main exterior pole. To my mind, some guys on that pole will be essential in bad weather. I would put them about 800 mm above the ground, but using the existing black anchor points would be easiest.
The single main exterior pole will be all that is holding the tent up in heavy snowfall. I doubt that this single pole is strong enough to take a serious snow loading, so you may need to keep knocking the snow off during the night. painfull, but better thsan having it collapse on top of you. :-)
I couldn't see the inner tent in your photos, so no comment there.
I have used a dome tent (MYOG, late 1960s) in bad weather and had to get inside to place the poles into the sleeves. I was told the sight of me heaving around inside the tent fighting the poles was quite funny from the outside. Hopefully, with the exterior pole, the Scarp won't be as bad.