Looking to install or build 2 or 3 deer blinds/shooting boxes at the top of several hollows on my property this offseason. What recommendations do ya'll have?

The idea is to put the boxes at the top of ridges over looking the bottoms and hollow sides. Not normaly what you see in the woods but my father and uncle are aging and need to make thier hunts easier.

We are open to buying premade or building from scratch....Thoughts?