So no cup packs, illegally tinted windows... I can see why it's not selling for 9l mate, it's just not that appealing and I can't see anyone snapping it up!
In my opinion any mods you get done to a car should largely be written off cost-wise... they are the owners choice and I weouldn't expect people to have to pay top whack for them after i had finished... as it was my choice to modify the car and I did it for my own benefit. I think returning it to standard, dropping the price to around £8k, then selling the mods seprately would be a good idea personally if you want to really shift it.
However the illegal front windows may be a problem... the police can pull you over and fine you for it, and are getting stricter nowadsys. it also won't pass an M.O.T. with them from what I hear.