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@Wingedangel
With regard to shot blasting, they generally use silica 'beads' and having done a little myself, you will be fine. it's not a biggy, just remember to remove everything that is damageable. ie...bottom bracket as you have said.
Everything else is pretty straightforward, the sand or shot will leave the metal with a slight 'grain', with regard to threads and internal stuff then don't really sweat it. the blasting will only remove the 'loose' stuff ie the rust...so if it is only a surface rust then it will leave it as clean as a whistle, just remember to file and clean anything that might not be finished properly, ie casting marks, little imperfections within your lugs, small dents and scratches, though once blasted the finish is uniform all over...
ie on your lug there you can see a uniform finish that is horizontally 'lined'... you need to get rid of this, as this will show up through the lacquer when finished
Be fastidious. Anything that isn't finished at this point will stick out like a sore thumb once you have the metallic lacquer on.
and how much are you paying for seperate blasting and painting?
Armourtex charge about £20 to blast and £49 to blast and finish...
if you can get your hands on a good compressor/lock up garage, I have a spot blasting gun that works on 'normal' sand that works at about 100-120 psi that would do your frame ok. if you would like to borrow it then shout, (I'm in hackney). if you then wanted to spray it I have refinishing guns too.