jim,
Down here in south TX, we've used "tower blinds" for 2 generations now (mostly home-made) because you often cannot SEE game more than 20-50 FEET without "getting up high" in the dense brush. - Many of the ranches have NO trees that are suitable for climbing or building deer-stands up in.
(Btw, here in "The Alamo City", we have TWO companies that currently make "pre-fabbed" towers.)
SOME of the "homebrew" builders have gotten "pretty fancy" with wall-to-wall carpet, soft swivel seats, cooking, coffee pots & even a porta-potty. = I know of one south TX rancher who converted a "trashed" Ford PU into a mobile tower-rig, so that he can easily move it about.
yours, satx