okay, i will try to add photos.
I have completed the tarp part - I added a tail to the back to block more wind, but it needs adjustment to have it line up with the rest of the canopy.
These are photos of the front and with my rain poncho as an extra vestibule. It is a "plexamid" style based on a a 1/2 pyramid tarp setup. There is a vent at the top. It uses trekking poles to set up. Next, I add in screening and a zipper and affix that to the bathtub style ground sheet (the plastic you see messy at the bottom).
When complete, it will be about 14 oz / 400g plus stakes, tie-outs and a small bag. I am hoping for under 500g total.
The peak is sitting at 125cm in this photo, and there is ample room to sit up and stretch out.
I used 70" wide Silpoly waterproof fabric, which means almost no seams in the middle to leak.
Cost worked out to roughly $45 USD for materials, plus thread and shipping.
I could buy a ligher DCF style, similar but more durable floor, a couple more features, for $549 USD, and 70g lighter, and doesn't need my poncho.