Okay...after lots of reading, searching and calculating I came up with this....
for a 2000 Orion HCCA 12D
2.5 cu/ft tuned to 30 HZ
14.5X2.5X35.49 (after port correction) internal port measurements
The box will be made of 3/4" MDF
I am mounting the sub on the long panel and having my slot on this plane running vertical using the side and back enclosure wall as part of the slot.
The port displacement is 871.8125 going back and then 90 degrees to the right is 765.31.
Bracing I will use 96cu/in total (8 4"sqaures cut into triangles and used in corners) and the sub displaces 244 cu/in.
A total 1977.1225 cu/in = 1.144168 cu/ft of displacement.
Did I screw this up or am I right? Thanks in advance.