Well my understanding of the BMI is it's highly dubious and prone to inaccuracy.
So any further extrapolation with that as it's basis is going to be even more inaccurate.
FOR INSTANCE: the measurements you've given accurately describe me, in my present state. Even the bodyfat % I'd say is pretty much where I'm at - @ 6foot 3inches and 142 kilos.
If I were to take the rest of your calculations as wholly accurate (and please correct me if I'm mis-reading) that would mean that the muscle mass I have now - after 9 months of fairly half-assed training - is pretty much the most I'm likely to achieve.
W.A. AMATEUR STRONGMAN
Axle clean-press: 100 kgs (220 lbs)
Bench press: 135 kgs (298 lbs) - 1st PL meet 16th October 2011
Deadlift w/Barbell: 180 kgs (397 lbs)
Deadlift w/Hexbar: 225 kgs (496 lbs)
Farmers walk: 240 kgs (530 lbs), 50 feet
Front squat: 100 kgs (220 lbs)
Log clean-press: 100 kgs (220 lbs)
Strict OHP: 85 kgs (187 lbs) 3 reps
Tyre flip: 260 kgs (573 lbs), 100 feet