Is the back window tinted too? I'd imagine that lot (sides, rear etc.) would be prohibitive ££ to change the glass - unless from a scrapper. My Q is dark enough as it is, being Anthracite - it would look like something from a 'Milk Tray' advert.
I was gunna go the full "pimp daddy" but though blue reflective would look groovy on a blue q and will be better for keeping the heat off the animals in the summer