VF - Thanks for posting these latest pics - fascinating as always.
One question though - do you have any av med issues such as decompression bends, altitude sickness, O2 ear etc.? Or is it just a question of getting yourself fully acclimatised by being "in theatre" for the job?
I presume that no amount of acclimatisation would dispense with the need for supplemental O2 at 23,000 ft - if so do you use a canula or a mask? My (RAF) training was O2 at 10,000 ft (air mix), above 25,000 ft needed 100% O2 and above 40,000 ft needed pressure breathing.
Safe flying as always.
MB