That's Mr. Meriman but he has been known at times to be a merry man. You might want to inquire if his 2.5" Gato Sub-Driver™ will work on your build - you should have enough space for one.
Didn't Tachikaze who build one? You'll want to contact him since he's well experienced with combat subs.
BTW, you'll find the The Sub Drivers Forum at http://forum.sub-driver.com