A small update. I have been attacked by time vampires from all sides. I decided to scratch the idea of buying the bushing kit for my router and ordered three 26" blank baffles from Erich. Keeping my fingers crossed he that he can do the driver countersink and cut outs as well. Next to order some Duratex and find some free time to go grab wood for the cabinets.
After lots of back and forth with Nate and his assistance in modeling some of the options I was looking at, I decided on the following.
Enclosure O.D. 14.5"x 24"x 13.25" = 1.86198cf
(Note: 13.25" Depth includes the double .75" baffle).
for the AETD12M and SEOS12/DNA360 (Est).
Less 4- 2'x 13"x .75"= 0.04512cf
and 4- 2"x 11"x .75"= 0.0382cf
for the strip bracing.
Less 13"x 2"x 14.5"= 0.21817cf
I am not considering the crossover network although I may add that estimate after it is made for the final enclosure volume.
After displacement I am left with 1.33049cf
This appears to give me an F3 in the 67-68 range. I was keeping in mind John's suggestion, "As a good rule i generally try to tune about 1/2 octave below tuning. This keeps the group delay and vent velocity down. So if crossing at 80hz, tuning would be around 60hz ideally or lower." on the first page
Add $58.15 to my total which is the cost of three 26" baffles.
More to come later. Thanks for looking.