Your colour scheme sounds awesome - Getting the options straight in my head, there seems to be two high level options - a themed approach like yours , where WW1 / WW2 airplanes seem to be the preference using stock decals , or a more traditional approach , possibly using chrome to break it up a bit and less decals.
I am quite attracted to a steampunk engine theme , matt black with lots of chrome.
CNeil do custom decals - apparently a chap who works there is expert at making one offs and fitting them ( I have seen his work and it is superb ) so some subtle coloured lines as found on victorian steam engines could be good on black. I must do some sketches in Photoshop.
If you are south Warrington , do you fancy a pint one evening so I can oggle over your Sopwith Camel ? My local is the Red Lion in Pickmere ( about 15 mins from Stretton) , but happy to travel.