A couple of weekends ago I flew up to the Goldy and took out the Gulliver Box SUP viewed in the video. It is 7'5" long x 26.5 wide x 4.25 thick. I am 67kg and 5'6" (hence the Smurf Avatar). I did a 4-hour non-stop session on it. These boards are built for performance and accelerate well and turn on a dime. Stability wise it took some getting use to however after a while it got easier. The trick is to keep the board moving and it's generally no problem.
I'm about to confirm my order and am likely to go with a 7'3" long x 27 & 1/4 x 3 & 15/16. Comes out at about 98 litres.
I am after something that I can live with in a variety of conditions so the litres reflects this for my size anyway. No point in wobbling all over the place with a sub 7' board.
These boards certainly live up to their reputation.
Not sure how long I will have the x32 the quality is a bit substandard to me! Paint ripped off while doing rail tape and peeled slowly but still come off , plugs look like **** and far to much room forward and aft after fins put in Then again you get that from mass produced china boards, but at the price it's stupid