Unfortunately, I don't own the land on which I hunt. Have never been able to afford to buy my own piece of heaven. So, I have built many different shooting house over the years - most of which I had to leave when the lease terminated. Only had this happen twice but man it hurt because they were nice shooting houses I had to leave behind.
The 3 I just built are really neat though and are "portable" for me now. I found someone selling used scaffolding. Bought 4 sets (6' high walk-thru scaffolding) for $30 each. Built 3 top platforms out of 6 sheets of 3/4" plywood (2 bolted together per scaffold set) with PT 2x4 "underside" framing. This gave me a 8'x8' solid platform U-bolted to the top of a 5x7 scaffold set that is 6' high. Do the math and you will see that 2 side have an 18" overhang and the other 2 only have 6" overhangs. I positioned the set up so that the 18" overhangs are the "sides" of my finished blind and the 6" overhangs are the front and back sides. I then added a 6'x6' pop up blind to the platform and instead of staking it down, I screwed it down to the platform. Notice the 6'x6' size fits nicely on that size platform and is shifted slightly forward on the platform to allow for a landing area before entering the blind. Added a used ladder for entry (used 16' adjustable ladders give you two 8' pieces that work well).
In all, I bought the blinds on sale for $69.99/each at end of last season. Bought the scaffold for $30.00/set. Framing required 10 (5 per sheet of plywood) PT 2x4s at $5/each at HD ($60 with tax). The plywood was given to me but is about $40/sheet ($80/blind set up; you can use 1/2" if you want but I'm a bigger guy so I went with 3/4"). I also added indoor/outdoor carpet to the plywood deck ($29/roll from an Ollie's Outlet we have here - Big Lots has the same stuff usually). I have about $275 in each setup and these are now "portable" for me. The ladders can be bought from numerous places with people looking to get rid of some. I also used 4 of those screw-in ground anchors at each corner (that can be used for tethering animals too) and attached cabling/chains with turn buckles in the middle for tightening. This hold the whole unit down in case of high winds.
Just an old redneck that found a way to make something pretty nice but still portable too.