I've seen your way done, Bob. I just don't find it practical for myself. I don't need to go that high, and my silnylon has so far handled high winds without snow wall protection. And, realizing we were discussing winter, THAT'S why I mentioned summer: to point out that you can adapt this same shelter and your needs to a season what has winds as high and precipitation as driven as winter, but no snow blocks available. Nice if you got em, make do without em. Again, we could debate the elaborate Sierra Club snowmason approach vs my pitch-it-adequately-and-go-to-sleep one. I'm not promoting my Betalight or pitching method. I only raised it to Simon to suggest he doesn't need to get a new tent for this trip. I think he, like I, can make his work.
Edit: OK, next-day add on to hopefully end the post, post, post water torture, Simon. Unlike Bob's pitch method for the Betalight (applicable to all floorless tents/tarps), my pitch method does NOT require "a lot of blocks,"...but it does require excavation on snow (thus work; one day I will retire to a Hillberg). For the record: like Bob, I lay it out flat on a tamped, roughly level surface, and then tramp around the perimeter. Hard. I lift the tent and mark a line about 4" in from the tromp ditchlet. I dig small "bricks" and stack them on the scribed "foundation." Eventually I will taper the outside of this wall and pitch the tent over it, fabric to the outside. As I posted originally, I like my high-exposure exterior doors to be outswing, so the harder the wind blows, the harder it pushes the door against the weather seal: " I wall the inside of the tent so wind and snow press the fabric against that i/o penetrating." Then you have to excavate the rest of the floor to the level of your brick trench. It's not careful quarrying, just free shoveling. Work nonetheless.
I bet you know all this from your floorless tent, which you have used in winter.
In conditions of low snow, or bad snow, where "bricking" is hard to do (or, yes, laziness) I pitch the tent high for the headroom it so needs, and then form the inner wall by just hand-troweling snow-mortar into the gap from the floor inside. Barrier snow walls are impressive and good wind bblocks, but too much work for my taste. I also notice that snow always drifts over them and collects on the bottom where you can't push it away from inside. This isn't a big problem, but an advantage of my way is you can go ahead and just seal from the outside with snow without flattening the pitch of the tent: you have that solid wall of snow inside to pile & press against from the outside.