I am in the process (design phase) of building a new duck blind on one of my ponds, and I was wondering what everyone else has used in the past.

I was looking into the following:
[ol][*]having my uncle weld a huge box for me to bury[*]building one out of wood[*]simply moving logs around and pulling up a chair[/ol]
Does anyone know where I could buy an already manufactured blind that will sit in the water?