Sorry but I cannot help this time. No doubt you are the one pointing the right direction for all of us with this impresive build.
Love the contrast between the dusted red primer surfaces and the grime on the dark yellow ones. A very mature and well executed weathering in my opinion.
Hats off to you amigo.
PS: Geez... you make me want to try a what-if myself one fine day...
PSS: Check your mailbox when you can, please.