For doubleweave, you can consider a single dark/light pair as the smallest number of threads in a pattern/background choice.
What's the best way to handle floating selvedges when weaving twill?
What's the best way to cut a multicolored warp off of a warping board?
The problem is that the snowball and pine tree design is a 5-block design. Summer and winter and doubleweave are both weaves that can produce it, but they don’t require the same number of shafts per block.
"Tromp as writ" means to “treadle as written,” and the assumption is that the “written” part is the threading draft. Here's more explanation of the term and technique.
