This is exciting on many levels.

I have so many fifteens sitting around ... nevermind.

I would have to buy any tens that I could rope into use for any of your ten inch designs. I have, but I still want to find some use for the vintage JBLs I own in quantities.
I once thought that fifteens were IT! So, after years of pro-audio, I have many leftovers still awaiting enclosures.

I would love to see more info as it becomes available!

(His headroom thinking implies brains to me, also).

I have not been up to 15's in WO or WO32 but 12"s worked well in both designs.
1000 watts! well thats much more than I have ever pumped in them, sounds like fun.