Being a keen woodworker I thought I better make my own observing chair, no plans were used but its based on a design by Peter Sayers I found online
The chair is 1060mm high, 380mm wide and weighs in at about 8kgs.
The seating Height ranges from 350-800mm.
The top notch is for seat removal and the rear legs are doubled up for stability, the wood used was mainly hardwood scrap I had lying around, but I used 22mm dowels for the seat supports.
I'll probably use this one for a while and them make a better/lighter version in the future when I figure out what features I do/dont like.