These are my own homespun (4 ply cable-plied, Exmoor Blueface fiber). The architecture of the socks is standard - gussets and flaps as per normal.
Here's another pair, which are a bit different because I did the gusset increases on the bottom of the sole. It makes for a slightly different look and fit.
[they look gusset-less!]
[gusset incs on sole of foot]
The flap done this way means you have no holes and no picking up, which I really like. I find it easier to execute than a short-row heel, which involves a lot of ...short-rowing! Which is not one of my favourite techniques...These flaps do not.
[flap with no picking up and no short-rows]
It makes for a very neat finish!