Are you tempted to go hybrid single skin like the duplex/dirigo? I like the design, seemed ideal to me till Mole pointed out the benefits of the SS/Durston designs. I'd guess single apex is better in wind ultimately though? Only bit I don't like with mids and full inners is getting in and out in rain without the bathtub filling. I'd be tempted to make something like your design in 0.8 cuben if the future was more certain, it's a lot of fabric! I've cut out the inner of my duplex copy, the fly now is no heavier than my tramplite so it's something I'd consider taking doing summer lowland walks, huge space for <350g. My Mrs prefers inners so I might buy one of the lanshan 2 inners, probably the winter version as Anna sleeps much colder than me. Weight seems about 500g so 850g all in. Be nice if knot did a 2p version of the mini mid with duel pole adapter and bigger vestibules/zips both sides.