I made my own blocking boarch a couple of years ago with a 2' square piece of 1/4 inch plywood and some foamcore I got at Hobby Lobby in the pillow section. I glued the foam to the plywood with spray glue, then covered the top in canvas fabric and stapled the fabric to the back with a staple gun. It is nice for sweater sleeves and small flat stuff, but I am usually making socks so I hardly ever use it. The size is definitely a limitation...I would love to have a board to block a scarf or shawl on but that would need to be huge. It was very easy to make through, if you need such a thing. I guess this is more or less what is described in the knitty directions, whcih I hadn't seen when I made this thing.
Would socks of that thickness even fit into shoes? I wear two layers of regular socks when we go hiking and they make my shoes noticeably tighter. Thick and Quick is huge, so I woud think they wouldn't fit.
Also, it's mostly acrylic, which on your feet might be sweaty and gross.
Just my 2 cents...I would probably use a DK/Worsted wool at a tight guage for thick, warm socks.