Very nice write up!!!
I see two issues with it tho,
1. You need to seal those speaker adapters!!!!!! If you put them in there "raw" like that, big big trouble!
2. The placement of the crossover worries me. That area on cars is known for rust and water penetration. Additionally isnt it a bugger to set the crossovers?
Did you happen to see any space where you could mount the crossover on the interior side of the door (part facing in toward the cabin)?
Lastly a question for you, when you removed the panel, are there any "fir trees" to monger up or any clips that may be a good idea to have on hand to replace?
Again nice write up.