Dave;
I think you are going down the right path/plan, I procrastinated with my ute for a couple of years not really knowing where to start or what was underneath the little paint and rust that was there, blasting got my bum into gear and I could see where I needed to go.
Wayne is saying not to get the roof blasted because some blasters are not as good as others and may use a harsh blast medium, can put too much heat into the panel when blasting and this causes the panel to warp or ripple, soda blasting is a good way to go I'm told but may be more expensive, my ute was done using garnet but the blaster was very experienced with old cars.
Maybe somebody on here can recommend a good blaster near you.
Answers to your questions as best as I know
Strip it down to bare bones and take all the panels you want blasted to the blaster this is a good idea including sub-chassis.
If you look back in my ute build you will see that I took my ute to the blaster on the rotis otherwise build a rolling frame as Wayne did it makes life a bit easier for the blaster.
Reuse/recondition as much of what you take off as you can, nuts and bolts are imperial threads (UNC UNF) and alot have heads designed to go into certain spots i.e. countersunk etc. so if you have them it is easier than trying to source again.
Lastly I think Wayne is referring to the K legs of the sub-chassis but I could be wrong

I'm sure he will answer.
Regards
Neil