I think building a cockpit would be a great hobby - I have two left hands (with all thumbs), so it isn´t for me...
I think, though (apart from the fun of building it) that the future is in VR.
I would just build a seat and flightcontrols mimicking the real ones (so you can grab them by reaching for them in VR). Probably a lot cheaper than building the cockpit, a LOT less trouble (getting everything to work) and you also get the benefit of being able to really lean and look out the window like you can in a real airplane (not with just a few screens giving you all sorts of trouble, too).
So yeah, my personal opinion - the days of home-cockpit building are counted. At least as far as trying to create a realistic flying experience. It can still be fun if you like tinkering.
Cheers, Jan