My passenger side headlight housing is much like that. In order to pull the back of the housing there are two clips and the outside one is very difficult to reach - especially in order to get the back of the housing off the clip needs to swing way out of the way. After a few attempts at reaching it with my hand - and I have very small hands - I decided to use a very long twist tie that was used to keep the Rudolph nose on the front of my Jag (ask the girlfriend, I didn't put it on there). After straightening it I put a small curl at the end which was just enough the pull the latch back up into a reachable distance and I was then able to reach in and latch it fully.
BTW, nice car, very nice updates. I've never really liked P-cars but after playing around with the PCA clubs at VIR and Mid-Ohio I have to say I'm starting to get a woody for them. Cheers!