If by real life, you mean the actual KA-50 Cockpit dimensions, then no. I just sat down in my chair with a tape measure, and guesstimated what a good overall size would be, comfort wise. Then fit all the components necessary onto the board.
Honestly, do not get hung up on having real dimensions, I don't know of anyone here or elsewhere having actual cockpit dimensions of the KA-50 or A-10C. And in reality, it will probably be either too small or too large for your needs as a simpit. Get it to look right, relative locations of gauges, panels etc and make it comfortable, that's more important IMHO.