I'm gonna compile some old prototypes and WIP's that I'm not gonna finish because of age, their complexity, my device's limitations, or me just not wanting to continue it.
You, the reader, may choose to pick up any of them and do whatever you wish with them, no credit or permission needed.

Prototype AO-1
A naval torpedo bomber that I wanted to test a hull wing configuration on.

Ferry Rocket
Nobody seemed interested...

P.111 Asym Seaplane
Only thing needing finishing is a cockpit frame, and maybe some flight performance.

Fw/BMW 803 Fighter
Well, I built this one, and got halfway through flight testing before I lost interest in this plane. It's just a bland design with little about it.

Paris Gun V2
Again, a design with a planned part count higher than my phone could handle. So much detail was planned for this baby, like a full rail car for it, and finer details you'd expect from a super weapon. Anyways, lots of peeps wanted this for a while, so it's here now kinda.

Super Sänger
Uhg... well, I lost interest in finishing her. I hit over 200 parts just building the bomb segment, meaning just adding all the smaller details present in the Zehn would likely kill my phone.

Me 264 b
This baby was meant as a collab between me and several others in a forgotten Kik chat. It never was finished because several people working on it quit or something.

UNSC Savannah
Ahhh... I remember this beast. I'm never gonna be able to finish this for a good while. She's almost complete, just needs logos and a propulsion system to takeoff, and maybe some guns.

Neubaufahrzeug
A weird design based loosely on a German WW2 prototype with a similar name. This was put to use as the base of an armored car in the early day's of that big WW2 RP I was in.

Asymmetrical Plane
Gah this plane was a nightmare. Good luck trying to make this work somewhat well.

Bad German Name (LuffenHaüger)
Well, it was an attempt for a WW1 challenge I believe in the early day's of forums. That's about all I can recall.

Odd Heli
An odd design. That's about it.

Triebflügel
She was an attempt. That's about all good I can day about it. Had no reason to continue working on it as Skua built a better Trieblügel.

Interior bomber
Me just messing with interior bombbays in the first weeks of fuselages.

First Heli
A nice lil' attempt at making a helicopter.

Folding plane
A odd plane built for a challenge. Man this was so long ago. (Back when "rating" was the system used instead of upvotes)

More of these designs will be added as I make them, so keep an eye out for anything interesting.

(Also, here's a FlaK 88)