You can ask Nicola of Xsite Architecture (she's here in Cakebook) but has anyone got a good suggestion of where to find detailed plans of the structures?
Approach the owner of the building, they might have the plans or could put you in touch with the architect.
Approach the planning department (Gateshead or Newcastle)
Approach Tyne & Wear Archive & Museums (www.twmuseums.org.uk)
Approach the local Library
Both Google Earth & Street View are fantastic ways to view the building from all angles.
'Bird's Eye' on Multimap is pretty useful as well.
On the ebay page for my structures this was part of the description: "The Seller hereby agrees to provide further building plans, images, recipes, on-going advice and training needed to ensure structures are sound and edible."
I take it that the building plans part isn't going to happen then?! Not that I mind, I'm looking forward to doing a bit of research into my building!
I contacted the architects who did the renovations of the Tyneside Cinema. They are very excited by the whole project and have sent me a full set of plans!