Hey mate -
I don't have a G-system (sold mine a while back), but do have a hard-case that works well with it that I was just about to put up for sale.
It's a NYC Pedalboards 'Pedalhead' board (black) with the butterfly catch upgrade.
You can see it here:
http://nycpedalboards.com/
It's in A1 condition - no dings or tears.
Willing to sell for £90 + shipping.
Cheers,
Sukh