That tent sounds great to me. I own a Refuge X and I would sell mine and buy that. I personally am not fond of the Refuge X design, as it's apex is a long way from where I lay my head at night. I feel a bit claustrophobic. That being said, I know I'm in the minority, so I know I would have no problem selling that tent.
I'm not totally sure I understand how your tent is significantly different than the Contrail. Do you mean because of the materials and size, or because of the design? Two poles in the front would make it more like the Squall 2 (although the Squall 2 has a small pole connecting the trekking poles). These are all minor tweaks on the same design, of course -- I'm mostly just curious as to how your design would differ from the TarpTent. By the way, I don't want to suggest you are copying, only that TarpTent provides a very easy model to compare tweaks. It is a pretty intuitive design that has been around a long time -- the reason TarpTent is so popular is because Henry has done marvelous tweaking.
Also, I wonder if you gain much by making it 1.5 person. The Contrail/Squall 2 have very good sizing, in my opinion. I wouldn't want either tent to be bigger or smaller. But a lot of this depends on how the numbers pan out. You make a nice, roomy one person tent (or tight two person tent) and get the weight down really low, and it will sell easily.