Yes, my Sq is a NACRA.

The mast in the video isn't an original Square mast. It's a stock aluminum 5.5uni mast that I've added a foot to. That said, though, you could prebend an original 'bendy' Square mast - just tighten the diamonds.

Charlie suggested I go with a prebent rig so I ended up with the 5.5U mast, it just worked out that way. I did, before the pictured sail, have a Kevlar Elliot-Pattison main with my original bendy rig. Which I had added a foot to that mast as well - it is a common modification for the old Squares. That is, to have a sail built that's higher-aspect than the old pinhead main, thus you need to add the mast height.

The bendy-rig Kevlar main wasn't as high-aspect as this 'new' Ullman main is, although it was higher-aspect than my 30' luff pinhead Dacron main. (I keep saying 'main' like there's another sail in question. Duh, that's what I get for buying a trimaran. Too many sails.)