That's a good suggestion. I may try that as opposed to cutting my baffles up. On the other hand, if I cut them into thirds, maybe they'll all happily fit without any additional sanding.
Here's the first 5 slats taped up:
-------------------- "We`re just waiting looking skyward as the days come down.
Someone promised there`d be answers, if we stayed around."
-Orchestral Maneuvers in the Dark, "The Romance of the Telescope"