I'm currently making one.
I could take some pics when complete, may be a week or so though.
I have what I think will be a very good design.
Part of me feels like on this subject is if you cannot design/build a quality stand on your own, you probably should just be buying a stand in the first place. But perhaps some people are mechanically inclined and just not creative.
I'm using 2x4x16' treated for the ladder section, ladder is 18" wide I believe.
It will have a guard rail and flip up seat.
Seat is untreated 2x12"
Platform decking is going to be treated 2x8" in part because I had a 2x8x16 treated already. Otherwise I'd probably go with a 2x6" treated as my decking/platform material.
While I am building one, I do realize it may be the only one I ever build, I figure it'll cost me perhaps $60 or even a bit more in materials, when for $150 I can buy a very quality steel stand. and I'm of course not including my labor costs... this thing will also weigh a significant amount, although I always have another guy to help me put up my ladder stands.
Feel free to PM me or I'll at least try to check back in a week or so with pics etc...