Robert:
Correct it would work with current mountings
I was thinking out loud and along the lines of how Computers have mount close to CPU for heat sinks etc.
Would have made a s neat CPU sandwich and casing could have gone around,
Would have been so cool could have used it for a fridge, well not really but would have been:sunglasses:
Our thoughts are the same.
I would suggest variant of the cooling system.
Use as the entire top cover of the case (completely instead of the top acrylic plate) a metal plate with an adapter, in the form of a metal cube, to contact the processor. You can use two configuration options.
Without fan (for operation of the system with medium loads or at low ambient temperature).
2 . With additional fan on the top side of the cover (for maximum load or high ambient temperature).
By the way, the existing radiator for VIM2 (if the mounting points coincide with the Board) is well suited for replacing the top cover of the case. And it will act as both the cover of the body and to remove heat from the processor.
https://www.amazon.com/Khadas-Heatsink-for-VIMs-Series/dp/B07DDKZ4MV/ref=sr_1_21?s=electronics&ie=UTF8&qid=1527805906&sr=1-21&keywords=Khadas
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