Good to see you here. I'm looking forward to seeing the 2-person version and how it compares to the Cloudburst---my favorite 2-person tent.
As regards EPIC, I'm curious how your tests are going. Personally, I have not been happy with the EPIC jacket I have. It is neither waterproof nor breathable. Once it gets wet, it is done. And, I found that as I used it more it went downhill quickly, possibly due to buildup of salts/oils from perspiration, etc. You may be using a different grade EPIC; I certainly would not want to rely on a tent made out of the EPIC in my jacket.
I have a Feathered Friends EPIC bag that seems to work ok at repelling water droplets from the occasional condensation in the tent (e.g. if it touches the tent wall). I do have some reservation, however, based on my jacket experience and its lack of breathability, about moisture buildup in the interior of the bag.
Based on the actual structure of the EPIC fiber itself, I wonder whether it is indeed suitable for long-term use as tent material (dirt, etc.).
What is the insdie scoop on e-Vent? Are you barred from using it as a tent material?