i would have a look as someone has done some great mods already im pretty sure they would be on most peoples wish list and a engine wash is easy to do, i run a itg intake and its not to easy to fit the original engine cover without cutting it up which is probably why its not fitted. personally i would use any bad points/worries to bring the price down a bit.
I know theres some pretty cheap edition30's out there but there not all in good condition so im sure the nicer ones should fetch a little higher price.