I messed up, mine's an 11' ridgeline, but 13' length at sides (significantly longer than the MacCat). It's not quite as wide, as I didn't want a second seam to worry about and cuben is only so wide (I forget exactly, but maybe a foot less wide overall/6" per side).
The 10-11 oz is just a guesstimate at the moment. I'll weigh it when I get it as part of my initial impressions post.
But, spinn is pretty light on its own. When we're basically talking about a sheet or two of cuben vs spinn with very little else involved (no zippers, vents, etc), you're not going to see a great difference anyway.