Lego Tower Bridge looks awesome but it's quite expensive and people have complained that it's a bit repetitive (obviously pretty much everything is built twice)..
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Currently £70 off at Amazon if you tick the voucher box
Picked up a "retired" Tales of the Space Age and made it into two modules rather than four to act as a backdrop to my modified, using a Rebrickable mod, Creator Space Shuttle. Cheap light set off
eBay was simpler to fit than it's instructions as all the 1x1 bricks were of the through hole type so selected ones turned through ninety degrees to allow easy passage of the wires to the rear.