I too like the design you mentioned. I first saw a tent with this design in a sporting goods store in Vancouver BC in the early 1970s and have been making and buying tents with this design ever since.
I'd suggest making a two person first. I think you can get it down to the 2-3 lb range(tent, fly and poles) easily using the lightweight materials you are proposing. You can use it for 2 person or solo trips and then consider the 1 person options.
I'd give the Tarptent Scarp 2 a good look and then modify as you see fit from there. Using the Scarp 2 as a reference I would make one for my use that was smaller, had no carbon fiber struts on the ends, had lower ends, did not have end walls on the fly, did not have straps for winter pole use and had a cuben fly.
The Suluk 46 tent has two poles. My experience is that adding a cross piece is well worth the small extra weight. Steve at Suluk 46 was also considering the addition of a cross piece. I think the Scarp's hooped pole is the best option, however. Pole is easy to make and easy to replace and interferes less with entering and exiting the tent than a straight poles.
Best of luck.