I picked up a beko tall (1.5mtr) fridge at the weekend, for just this job. And sat here drying off after cleaning it out.
(I also got a small undercounter freezer in the bargain. As the guy was moving the next day and it had to go. Great, I was out of freezer space already.)
I will cut some view holes in the tin plate to check that there are no elements on the sides, before going in with the hole cutter. Looking at the way the drain works on it, I reckon the elements are on the back.
Once the holes are drilled in the sides, for the bar, I will rivet some steel/ali bars on, below the holes, to spread the weight. And avoid having the sidewalls buckle outwards.
And some adjustable vents with fine mesh, will go in the door. As I know this is safe to cut.
I'll probably remove the evapourator for the drain and fit a pipe out of the back. As this will live outside, and means I can sluice it out without worry.
Any further suggestions welcome.