[chrislandy]

Take a look at SELOC if you can, thats well established with loads of content and would be a good template / ideas for the re-vamp.

Also a mobile version of the site and/or android app would make a good addition.

wrt the paid suggestion above, the bristol kit car club has a paid member section which allows you access to negotiated discounts with various suppliers.

Rovertech also has a "rovertech delivery network" so you can try to arrange "free" delivery for s/h parts e.g. if someone buys something in liverpool and you live in devon you can ask if anyone is passing that way to pick it up and bring it down. Obviously this requires an element of trust but its worked for a good few years on that site.