Well it's not a cheese straightener!
(Bonus points if you know the joke.)
Those fine people over at Lake Junction Models came through for me.
They offer a Missouri Pacific caboose kit that is painfully close to the Wabash 2600 series of cabooses.
That's easy enough to make happen.
The other major detail variant is the 4th window at the cupola end. Some of the 2600 cabooses had them, some didn't. Some had only one on the left, some only had one on the right.
To replicate that I had Lake Junction cut me a number of sides without the 4th window. That way I can mix and match as I wish.
With this influx of kits I'm now well on my way to having the needed amount of cabooses for the layout.
There's actually a 13th caboose kit in the box, but I'm not talking about that one yet.
It'll be a surprise for later.