The Engels ST90F has a very good compressor as you say the problem is the insulation
At some stage early next year Im getting some Aerogel Cryogel Z Insulation its for a freeze project that im doing for my forward cabin entrance.
For me the ST90F fits in to where the old fridge was and gives me room for my sink . I removed the old 30 year old fridge last weekend . To me it wasted space and needed to be updated also I need the room for my sink in the same cabinet.
What I may do it see if the engels can be re insulated with Aerogel as well and the other longer term project Ill be doing. I got a work discount on the Engels .
I may see what can be done to improve its power usage because of its current insulation perhaps I can remotely fit the compressor and then insulate the out side of the fridge .I'm not a person that worries about warranty much .
The other option was going to be much more expensive .
Ive lived out of a Engels many times over the years up the territory( early 70's)and other places there a very reliable fridge and I do like the Sawafuji swing motor as it will run on very high angles . The main problem would be the insulation and Ill over come that problem some how. Bit of time and TLC
Im hoping to fit a small ice box in the cockpit seat storage compartment and use Techni Ice Heavy Duty Reusable Dry Ice packs which id change over from the fridge so the fridge wont be open to long during the day.
The other option I was thinking about is use a Techinice ice box and add my own fridge inside ( more insulation and aero gel)
These ice boxes are reasonable good at holding ice for long periods
http://www.techniice.com/ice-boxes/signature-series.html. The one thing that I dont like with having a top opening fridge is contamination and and If I have some thing on top of the bench top I have to move it to open the fridge When I fit my sink Ill also make a cut out thats fits over the sink to make the bench top complete ( cutting board /sink cover)
Heres what left of the fridge cabinet

you ready for it Donk
The Engels fits in the left hand side and sink on the right and a set of draws under the sink roughly 400 cm wide.
Maybe Ill use some of my Teak window shutters as trim