Completely understand, launching a new product has to be done right and not cut corners on QC -- that's what helps keep us loyal.
So there's some time to start planning the build. Will you have plans for these? A cube 10.5" (outside) gives the .35 cu.ft. mentioned above,
but I've heard mention cubes are typically not desirable for speaker enclosures. Also, for a sub this size, what kind of bracing will be needed.
I've made several of your "classics" and servo subs and am familiar with how those are braced.