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Here is the MidQ 12" SVC WinISD file right click and choose save as. Please note, I also measured various Kappa driver and verified that the provided specifications are within close proximity to actual measured specifications.

There have been a few people who have built these subwoofers. Here is one detailed review. Here is very brief review from a professional touring sound engineer with a few platinum records under his belt.

If size is an issue there are other high quality similarly priced drivers that would be suitable in smaller sealed cabinets such as the Eclipse SW8200 12" driver which has more linear excursion than most 15" drivers verified by Klippel testing. This unit in a 3 cubic foot sealed enclosure with minimum 500 watts or 1000 watts ideally and an EQ would result in an extremely high performance, compact, subwoofer as well.
 

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The only thing I dont get is the port lenght I get is 64.64" long with a 12.5"X3" port. 4 cubic box 19hz tune? how am I not hitting your 55" spec? a tuning freq of 20.4hz gives me a 55" port lenght and the cone excursion graph is spot on your pic in the simple 12" kappa build page.
The modeled tuning is 20.4Hz, but when it was measured tuning was 19Hz. The difference is not significant either way.
 
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