I like it all except the boot spoiler
As for price - what somebody will pay, but here's my thinking
Front - same price as an ///M - £300 assuming no brackets needed)
Sides - similar price to aero so say £200
Rear bumper - needs quads so more money, but say £200
Boot - nowt, but argue around £50 with a clear light, etc.
Guess I come up to £700 - £800 all in as what the seller would expect, but wouldn't pay it as you'd need £500 of spraying.