So I originally planned for tweeters in the sails and mids in the pillars. I wasn't too sure about aiming or enclosures with these 89EX's so I set out to build a test box.
I'm looking at them on the bench and thinking about where to find a box about 4"x4"x3" so it would be close to the recommended enclosure/pod size compromise I came up with.
And there it was, so I began
Needed a mounting surface. 1/8 abs I had laying around
Stiffened up with some duct tape
A few layers later I had a box stiff enough to do the job and still pliable enough to wedge in to the dash and windshield at different angles.
It took me 20 minutes to fabricate the first one and 8 for the second.