It's the only thing I'm curious about...I believe the board will bend under his own weight. Your frame will have to be very sturdy, and you'll certainly have to find a solution for good balance between levelling and vibration.
The vynil field cover will be expensive, for sure
and speaking of the game itself, the defensive strategy will be really hard I guess.
It is an impressive project. I've got a big board, around 45x25", and it 's already big and not so convenient, no matter the big advantages it brings to the game :o