Well then, Nausicaa is filled with interesting aircraft. From the little jet-assisted glider that Nausicaa herself owns to the great, huge lumbering Tolmekian "Airships", they are all very interesting. Let's have a look.
So, a would-be analysis:
Handling: Difficult. You would have to stop it from simply falling over and stalling all over the place during flight.
Speed: Quite high. Or high enough for what is like a surfboard in the sky. In the film, it did show to keep up with other, larger aircraft, though.
I don't have a picture of one of these, unfortunately, but let me describe it to you - enormous metal pile of reclaimed scrap.
The wings, which must be at least a quarter of a mile long, eclipse anything made in real life. Ever. They have a low aspect ratio and unbelievably high camber, with the trailing edge about an eighth of a mile behind the leading edge. These would produce, I suppose, in theory, a bit of lift, but would be massively inefficient. The wings have a seemingly random amount of jet-pods containing powerful... well, jets, that shove the unsightly behemoth around the sky. The rest is simply feuselage, containing many decks of metal things. I think it's safe to say that they wouldn't fly very well, if at all.
Handling: Non existant. It would probably collapse under its own weight.
Speed: Very, very slow.
THE VALLEY GUNSHIP
Once more carrying on the tradition of having no empannage, it would fall backwards or forewards in flight. The wings have a high angle of attack, high camber and interesting tip arrangement, which would probably create a medium amount of lift. The jets, which are all inside the wings, would probably make the wing explode with the pressure as it seems that some of the jet is projected towards the aerolons. Whilst this might create some interesting maneuverability effects, the aerolons would more like than not simply break off. The massive cannons would weigh as much a tank on the nose and probably cause it to simply, hmm, what's the word... snap off.
THE TOLMEKIAN FRIGATE
I don't know exactly what it's called, but it's frigate-like, so that's what I'll call it. With tandem wings in a high camber with a high angle of attack, they would fail. One wouldn't. But two on equal elevation would, as the airflow for the second wing would be disturbed by the front one. Also, it features four jet pods. Once more, if it were simply just the front ones there then maybe it would be alright, but then the Tolmekians decided to plonk another two directly behind them, which would create some very interesting air flow effects. Even if that was alright, it once again lacks a tail so it would simply crash through lack of yaw control.
Handling: Good, as the wings could all work with eachother to achieve movement. Unfortunately, there wouldn't be any lift produced by the rear wing (or at least, none to speak of), so it would probably stall backwards. also, with the front jets pushing directly against the front jets, the rear wing would probably just get yanked clean off.
Speed: Fast, with four high-tech jets pushing that relatively small amount of metal around.