I would just get a 1x2 board and screw it on the back. Or onto the legs.
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Hmm, something 3D printed, perhaps?
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.
I went ahead and used large binder clips.
I pushed the two cabinets together, removed the clear windows adjacent to each other, wrapped the wood in that thick and pliable clear plastic shelf liner, then used binder clips every 3-4” across the inside of the whole frame of the windows, marrying the two cabinets together with a plastic seal. Worked like a charm and much less intensive.
Now, I did have to buy a jig saw and shave 1/4” off the inside edges of both top display windows/doors. They wouldn’t shut otherwise.
too bad you can’t get plastic unistrut. that would be perfect.
although apparently you can now get fibreglass unistrut. how healthy are your lungs feeling?
https://unistrutstore.com/fiberglass-unistrut/fiberglass-channel.html
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.
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.