RE: BT Bf109E-4
thanks ian. you're right about the how lightly this builds. i'm wrapping up a TF spit and these two don't even compare, the TF being a refrigerator compared to the BT design.
for the cooling, here's a shot of my plan to add ply ducting from the top and bottom inlets and exhausting the air through the rear as i believe you did from your description (sorry that it's hard to see, i did it in pencil). i had thought of the using the exhaust stacks as well but still undecided on that. my plan is to resin cast the stacks and not sure if i want to drill holes through them.
your model is fantastic! i would swear that the second pic is of the real plane. very well done! you've set the bar for me on this one.