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We're both right.
Something neither of us had thought of - the fins and frame of the outer panel have to be extended by the depth of the insert.
If you visualise the insert as sitting on top of a block, you need to lift the surrounding fins to provide the sides for the insert. To maintain a valid outer panel, the fins for all the other wells have to be brought up to the same height, giving a flush finish.
-- edit---
On reflection, this is a better way to visualise the skylines (which dont have fins)
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If you visualise the insert as being let into the well bottom, you need to make the fins deeper so the insert for the maximum-depth well has some sides.
--- Edit: added pic --
The attached cross-section of an N7 diffractal has the faint lines showing the depths of the standard diffuser, with the inserts below that.
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Either way you end up with the same diffuser.
(hope you haven't cut the fins yet...)
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