Bernoulli's principle surely applies here.
While hindendburg explodies are cool and all, I refuse to put my name on the blueprints. (I make aviation blueprints vocationally!)
DF has:
Copper
Aluminum (and ores)
Nickel
Chryolite
Purpetual motion machines
Charcoal
This is pretty much everything you need to make a knockoff 2025 aluminum alloy, mass produced aluminum, and real aircraft.
Sure 2025 is corrosion prone, but you can use zinc instead of copper and get 7075 instead if you really need it.
2025 is an alloy of aluminum, approx 30% copper, and approx 15% nickel. 7075 substitutes zinc for copper, and has a few other things in it, like magnesium.
2025 is what ww2 era craft are made of.
Aluminum bronze (copper alloyed with aluminum) is hard and electrolytically safe for 2025 aluminum, and makes good-enough rivets. I doubt our rattletraps are gonna be supersonic you know.
Wing loft curvature is black magic voodoo involving parabolic surfaces and curve-continuity spline profiles, but I have seen designs from every major factory. (I work for an outsource supplier.) I can slap together something that will work.
I know how to calculate setback and K-factors for formed sheetmetal parts by hand, (a rare skill these days...) so I can approximate rivet hole locations for flat patterns prior to forming.
If we just use a twin prop design instead of a jet, and fuel it with biodiesel spiked with booze, we should have a nice low altitude craft banged out in a little under a year.
I nominate kobold test pilots.