As far as remaining "moveable", I think you will have to stay with a pop-up ground blind. These work great. I have tried some of the low priced ones and I got what I paid for !!! None lasted any time 2-3 seasons then kaput. Packing is doable for sure. Cost ... is what your budget will allow. I have used a Double Bull I bought years ago and it has held up great. But it was not cheap.

As far as building one from scratch. I have built over 20 tin roofed box blinds (4x4 -6'6" and 4'x5'-6'6" and a few 6'x6'-6'6"). I have always used new materials. Certainly not easily moved and certainly not cheap. These days, materials are about $300 for a 4x4. If you want plans, there are many out there on the net ... free.