I will give you fluff, gimme designs! :)
The Butcherbird is a light fighter intended to fill a wide role-it's meant to serve as a ground-attack and light interception platform built and intended entirely for export in the 3050-3062 marketplace. That's right, the Great House that owns the production line isn't keeping any for themselves, it's meant to be sold out and sold off, whether to local mercs, local vassal lords, the periphery, or foreign alliances, the Butcherbird is a plane built to sell...and by sell, we mean, it's built to be as dirt-cheap as possible while being relatively effective against serious opponents. Much like the famous Mig-21 or F-5 "Freedom fighter" it is intended to serve in multiple roles, be easy and inexpensive (relatively) to maintain, and cheap to construct, while being adequately durable in a fight with statistically better or more numerous (but not both) opponents.
To that end, very little recovered tech was used in the design of the craft, though the wiring harnesses and couplings were designed for significantly heavier uses, and the engine compartment was designed to be able to accomodate larger, bulkier, and more powerful engine packages with little modification (this also makes it easier to maintain or repair).
Studies of physiology and psychology were used to design a flight deck and instrument panel that would be easily trained on, and the first models are two-seat advanced trainers. Notably, the aircraft's controls are intended to be responsive and intuitive for pilots trained to fly more ordinary, and mundane craft such as VTOLs or conventional civilian airplanes, with control switches arranged in 'fingertip' fashion to enable (with very little training) pilots to quickly select weapons and other systems with minimum movement under high G-loading stresses. Instrument displays are projected on a heads-up display to enable situational awareness superior to that of other common succession-wars-era cockpits, and the cockpits themselves include a variety of ergonomic solutions to enable pilots to function at peak efficiency with minimal discomfort, including but not limited to pilot relief tubes being integrated and angled to maximize the pilot's ability to 'release pressure' even while under high G-loading without discomfort or disgusting messes.
while nothing in the design is particularly advanced, the pilot ergonomics, easy maintenance, speed, and fuel range are considered exceptional for a fighter in this price range (competitive with used staples such as the SB-27 Saber), and the use of technologies being phased out of front-line service by the Great Houses further reduces the over-all cost of the design for operators.
[let's see what kinda stats you guys can derive from this]
