Now then, I've got some Infinity 6*9's that need fitting in the rear, problem is I've never installed 6*9s before - all my other ICE were easy replacements.
WHhat kind of material do you reccommend I make the rear shelf from - would it be ok to attach 12 or 18mm MDF to my stock shelf and then jigsaw the holes in? Reasonbeing I don't particularly want to pay £60 for a custom shelf.

Any tips would be appreciated, thanks.