I use TrackIR as well as many others in this game. Once you get use to it it is very "immersive".
The newer video cards have the ability to hook up multiple monitors. again, a number of people fly with triple screens, or 47 inch 50 inch or bigger single screens.
I don't believe the gauges you posted will work in the game. The data for gauges is NOT transmitted in the packets other than for your on screen gauges in the cockpit. As for the extra controls thos may be out of the question as well, but there is a work around. ANY USB controller can be used, and the number of them is up there. Some people have pulled apart joysticks and rebuilt them to be switch boxes much like the one you posted.
As for cockpit/simpit, again many have built them.
This is the one I used for years...
Money and imagination are the only real limits! Have fun!