Rudiments of Flight deck design
Cockpit Ergonomics/crew anthropometrics,System design based on aircraft economics as the base line,aerodynamic and structural inputs from the proposed aircraft design,seating and emergency escape arrangement,electrical and electronic compartment location,panel optimum viewing angles,windshield and overhead angle,display options, control levers position and reach options,Instrumentation displays to comply with international design standards,
standard/.efis instrumentation mix, pickle /rotary/push button switching,control colum design (rams horn,u wheel,or joy stick design, fly by wire or conventional control systems,cockpit door security and control system,communication systems,glareshield design and interface with flight mode annunciation,emergency equipment and systems,HUD systems,Throttle quadrant design...e.g boeing versus airbus format, etc..seat upholstry design depending on mission requirements,sealed windscreen versus window type design, oxygen and ventilation systems,rudder pedal and nose tiller design and whether singular or dual tillers.
At some point you have to consider inputs from structural engineers, telemetry and instrumentation engineers, aerodynamiscist, ergonomists, cost engineers etc...
just my humble take on the matter