I made a single pole tent like this 30yrs ago. Not DCF , obviously. I used shower curtain fabric (waterproofed) - that's all I could get my hands on.
I put 2 zips up each side - approx. where the seams are. It gave numerous ways to configure the door.
I made a 'not very good'
inner for one side for sleeping and had an emormous porch in the other side - I like big porches
.
I had a tape, with grommets at the ends, ran the length of the tent to hold the poles at the correct distance.
Still in the loft tho' I'd not use it now - altogether too heavy for todays expectations - but I loved it then
.
Suggestion - don't use DCF for the pole 'tunnel' - the abrasion will wear holes in it too fast.