I can't help you with that, myself... but welcome! 

i have plans for building a hybrid semi-pit for flying planes and helis...

but it's a way more generic project, i plan on using my saitek x52pro for controls, bolted to a console that'll hold it upright, so i can pull on it as  a collective lever... won't feel that realistic, but its a tradeoff one has to make when choosing versatility over a true-to-life simpit

oh and welcome to SimV   this here is the boiler room of out little nuthouse, feel free to jump right in  


oh one more thing, i remebered now i once saw a heli training pit at a games and sim convention once...
it belonged to the brazilian army, they used to to train their heli pilots i think, and i stood around there and asked them about it...

it was quite a simple build actually, they had an actual collective and cyclic lever from the Eurocopter 'Squirrel' chopper they use, which they removed and rewired for interfacing as a joystick, also they had some rudder pedals, not unlike the real ones as well

for display, they simply used a large screen LCD TV for external view, and another smaller display for the gauges

it was a one aircraft pit, but very simple and to the point, i tried it and it felt quite realistic, even though the cyclic was a little broken, but i gather that was from the abuse of the thousand others that had sat there before that day


Cheers

Looking forward to monitoring your progress.  Welcom to the SimV Homebuild Cockpits Form section.  Otherwise known as the "Asylum". 

best,

..................john