lastbit in terms of what your doing you might want to try this as modding not uploaded all details yet but this s on a batch 2 unit and working out the layout for batch 3 will have details on my website when I get around to it.
Thanks crazyearner. Indeed something along the lines of what you did. But batch#3 id different, each 2 modules are arranged in mirror with heatsinks facing one another. And I'd like to keep high airflow on the pcb and chips surfaces too because I believe it may play an important part in cooling.
The pattern of holes attaching the heatsink to the bottom plate is different between batch #2 and batch #2. Batch #2 uses 7 holes, Batch #3 uses 5 holes.
Has anyone made a hole matching plate, perhaps 3 mm aluminum with countersunk holes?