IKEA METOD search internal dimensions, side wall thickness?

I don't mean the base plate = to which the feet are attached...

No no. I mean the floor, which is fixed on the picture you linked using the metal part, it is located at the very bottom in the image of the complete cabinet, just above the base plate.

Of course you can place the refrigerator directly on the base plate, but then the door won't be long enough again.

Why, 140 - 1.8 = 138.2, 2.2 cm remain. All the feet of the refrigerator can be adjusted, so screwed down by 8 mm or, to be safe, also 10, then it should work...?

I thought the 3 cm were already with the feet screwed in all the way. If the edge of the door is square, it might also be possible to install [Schlepptürbeschläge].

Try it out and if it ever gets too annoying, you can buy yourself a real refrigerator.

"a proper refrigerator" *g* We are quite satisfied with it so far... since we feed our cats raw food, we just need more space and have chosen this taller refrigerator plus an extra freezer instead of one of the usual combinations. Thank you very much for your effort!