Selling Cosmos 2? (its slightly modded)

[Mister_K]

So it has come the time where id like to finally sell my half modded Cosmos 2. The case is simply too big and id much rather get something like the Corsair Air 540 instead.

Any ideas if anyone would buy it? Do people actually buy used cases? If so, how much would I be able to get for it in GBP? (the PSU cover to hold it inplace is gone, might be able to find it). The condition is used but not abused.