I've just been researching plans for building a high seat and had a thought: rather than a seat, has anyone built or come across a platform that would allow you to shoot prone?
I started thinking about this because I'm about to put something up overlooking quite a large paych of clear fell. The position it needs to be in has no existing trees for support, so it would need to be free standing and enclosed, or at least screened. And it is likely that some of the shots I'd need to take from it would be out to about 220m.
So it ocurred to me that an approach might actually be to build a sort of screened platform - something like a 2.5m high 'table' to lie down on.