That is very interesting. I have under construction a P-51D metal using exactly the same method. (
http://www.dogfighters.net/phoenix-a...51projectl.jpg ) It kinda got out of hand with the metal and became hard to control all of the areas of construction. Takes up far too much time for me too, but it looks like you are making it work. I now use the "oils on canvas” technique which is layers and layers of colour and tone one on top of the other. This method can be just as troublesome to keep tidy, but it is one I am more used to handling.
Like I said before, your XIV is looking great and I am looking forward to seeing the finished profile.
Good luck.