type r box

Hello,

I want to help a friend of mine build an enclosure for a single alpine type R 12".  I would like to build a slot ported box for the sub.  I've built a couple of sealed boxes but this is my first ported one.  It will be going in the trunk of a 98 malibu.  We have about 34" of width between the fender wells and about 18" of height.  I'd like to keep it from coming out past the back deck so we have about 20" for depth.  I would like some recommendations on dimensions for the box if anyone has experience with type R's.  I want it to be as "tight" as possible even if it means sacrificing some output.  Also what side should the port be on?  If someone could draw a simple diagram that would be very helpful.  The sub will be pushed by an Alpine MRD M600 rated for 600X1 rms at 2ohms if it matters.  Thank you for any help.