If I weren't terminally skint, I'd've had the deluxe seats off you, and the tilt (already got a truck cab).
3/4 tilt, I last saw one go for approx £40, think was including sticks, supply / demand / price, low demand hence low price, low supply too though, so you could get lucky with a higher price, people can always haggle (though they won't). I was going to look at your gallery, though it's down at the mo... You got any pics anywhere else on t'Internet?
Pair of seats, again supply & demand, like I said I'd have them, though skint, I'd reckon off the top of my head £10 each may be fair ?
Truck cabs seems to be in high demand, window channels are cheap from anywhere so that's not a worry, some people worry about the dents, most do not. I couldn't guess on a price though, as not really watched them closely enough. You'd get more for a truckcab than van sides & roof if that gives you any clue? Somewhere £60 - £100, guessing really.