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It's true there are thousands hanging around that need putting to use (cheaper to make a new one than ship back empty to china) but if you're doing any significant alterations to the walls you need to add a lot of structural steel to get the strength back. Plus the fact it's probably coated in some pretty nasty paint and fungicide/insecticide.
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All you'd be doing is cutting some holes for services as well as the side wall for the apparently omnipresent, on trend bi-fold doors and then sealing up the doors at the end.
Shouldn't be too difficult for anyone with half a clue.
It's not going to support a great deal of weight (like another storey) so should be structurally sound as it is. Look at container city...
Angle grinder/plasma cutter, bi-fold doors, cover it in ivy and bob's yer uncle.
Genuine recyling and therefore more ecologically sound. As long as you give your neighbours plenty of warning, they won't moan.
All in for a couple of grand leaving more for bikes!