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That’s good, you’ve got the purlin supports in - they’ll be doing more work than the stud walls.
What you want to achieve in your attic is essentially an insulated box with air flow all around it, except underneath. So it may be pertinent to leave the stud in and use them for that purpose, leaving the space beyond uninsulated (but for the floor) so it can ventilate correctly.As on the left portion of TW’s picture on the last page.
Dugtheslug
I don’t believe they’re holding any load - there’s a purlin on each side which supports the rafters, and a diagonal strut which runs from the centre wall in the middle of the house up to each of the purlins. Those struts had been removed at some point (presumably to open up the space for use as a room) but have been added back in by my builder when we got some other work done.