On my web site I offer Detail Sets from models I made.
Picture or drawing are not precise enough for making details. OK, on some position it work, but on curve of the fuselage you need to have model if you want to made detail in right size.

So, for P 38, or any other model, I can made set, but need to have dimension of every detail.

Maybe, easier way will be to send me how much, for examples, you need circles and diameters of it, how much rectangle with dimension, and so on...
In that case, I'll made those detail, add rivets and dummy screws, so you can later apply it on your model.
But, as I told, first step must made you, sending me e-mail with dimensions and number of parts. I don't need drawings, just number and dimension of parts...

Price will be same like for every Detail Set - 55,00$ + shipping ( 15,00$ world wide )...

Best regards

Mirce