No need to hypothesize. Here's a photo of it:
Quoth AirDailyX.net:
Being that AirDailyX is a flight simulation based website, I thought I would share that MH370 Captain Zaharie Ahmad Shah was a very big flight simulation enthusiast with a set up so nice, it would make many of us jealous. It's always a bit warm to the heart to see real world commercial pilots enjoy the hobby we all so dearly love.
Thank You. Do we know if radar was involved?
Interesting.
Love to know what data concerning his ‘practice’ activities the authorities got from that setup.
I hope this was just for fun/keeping his skills up to par or higher. I hope that it was NOT used for nefarious plans with the missing plane...