Javelin,
that's great to hear that you want to make the gauges, MFD's etc. useable to an external monitor. I'm also building a homecockpit since many years now. Sadly I had to stop working on it the last two years, cause of some changes in my life, but now about September to October this year I'm back on it again.
Here is an old link to the project at SimHQ. Not much changed the last two years, except a new computer system and some minor upgrades. There is still plenty of work to be done.
http://SimHQ.com/forum/ubbthreads.php/topics/4356848/universal-cockpit-project-1#Post4356848http://SimHQ.com/forum/ubbthreads.php/topics/4319086/universal-cockpit-project-2#Post4319086Since those days I changed my decision to also use some of my good old simulators like Longbow Anthology, Janes Series etc. cause an additional retro system in the pit makes things much more complicated.
I'm going to make it useable for DCS, BMS, Strike Fighters Project 2, EECH Allmods, FSX, Steel Beasts Pro PE, Dangerous Waters and ARMA 2 & 3 (SB Pro PE and Dangerous Waters only useable from the WSO-Backseat which is more flexible with the input controls). For DCS, BMS, EECH Allmods and FSX I want to have working instruments and MFD's. For the rest simple input with keyboard emulation for switches, dials etc. is enough.