I would just get a 1x2 board and screw it on the back. Or onto the legs.
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Maybe a closet rod holder and you could get a closet rod and cut to size? Unless I'm thinking of something completely different from youre describing
This is similar to what I had in mind, but rectangular instead of cylindrical, and that had a lip on the ends of the bar that slotted and locked into “C” plates on both ends.
But, unistrut bars across the backs of the cabinets also might do the trick, instead of bars in between.
too bad you can’t get plastic unistrut. that would be perfect.
I suppose I could put two unistruts across the backs of the enclosures, near the bottom and top of the window top half. That would stabilize it enough that you wouldn’t really be able to flex the fronts together.
although apparently you can now get fibreglass unistrut. how healthy are your lungs feeling?
https://unistrutstore.com/fiberglass-unistrut/fiberglass-channel.html
Are you trying to stabilize the tunnel or the whole cabinets to each other? Or both the cabinets to the wall?
Cabinets to each other, probably 3-4 stabilizers, 1 per corner of the windowed sections between the two cabinets.
Why not stabilize the cabinets to the wall, like with child proofing wall anchors?
What's going in the middle? I think the easiest/best looking way to do this is to add some shelving at the bottom/middle and that could stabilize the two cabinets together. And if necessary add extra bracing in the back behind the cabinets.