Blimey YB,
sounds like your trying to build a second bike on the sly.
One of my mates once brought a bike, disassembled it and stored it in his loft. 6 months later he declared to his missus he thought he had enough 'spares' to build a second bike, which he duly did
Sounds like you got a good deal on all those sprockets & chain. I guess I'll have to keep my eyes peeled.
Cheers,
John.