Cheers for the comments guys.
I boxed in the back of the headlights purely for aesthetics. With it all boxed in, you won't be able to see any headlight wiring from the engine bay side, also you won't be able to see the headlight (obviously) which was what i was after.
You can still change a globe, it's just involves removing the grille and pulling the headlight out via the 3 adjustable screws as you pointed out Ari. So instead of it taking 2 minutes to replace a globe it might take 10. No big deal.
I used to have the air filter right behind the L/H headlight and yes, it was a good source of cold air in that respect, but with this build the filter will be under the L/H inner guard behind the rad support so there was no need for the headlight buckets to be open. I will probably be building an airbox under the guard that will pick up cold air from beneath the front panel.