MikeJD - Thanks for the reassurance that what i'm doing will ultimately be useful, although slightly different.
Based on that I may have a search around for a dummy rig to wear in tunnel to get as close as i can to reality.
Your last paragraph "aside from all the physical limitations, never underestimate the effect on your brain of actually jumping out of an aeroplane for the first time" really made me think as yes, I have seen the all the you tube videos's where the student does absolutely nothing and forgets he has to pull, or spins out upside down etc. It's that bit I'm hoping to avoid
Lastly I'm pleasantly surprised at just how helpful people are here and I must admit, I paused before posting the thread as these to everyone else are such basic questions and I thought I might get shot down but that's not been the case.
Thanks again....