Would this design work as a vertical MTM? I'm thinking a 7-7.5" wide baffle with mid/bass drivers centered and tweeter offset. Obviously this means that the close driver spacing would no longer exist between the two woofers but in a vertical MTM this is usually more of a benefit than a hindrance. I'm also thinking of bumping the volume up to .75 ft2 with the same tuning. This provides a little more bass extension at the sacrifice of power handling but being an MTM design this is not quite as important as with the MT.
I already have a pair of DA135-8s so if this does not look like a good idea I will simply build the Mindignia as designed . . . BTW, what did you end up with for padding down the tweeter. I seem to remember you saying somewhere that you found the original too bright.
Thanks in advance for a great design.