Just realised I didn't come back on this!The SI website has some measurements on their plans at the bottom of their page:
Stereo Integrity | HT Subwoofers
but they don't particularly specify an inward-facing cutout.
Looking at the roll surround relative to the rear mounting face (which it would rest on if mounted 'normally') I think the recommended cutout size is fine, and Nick at SI told me the same by email when I was asking about the 18s.
I can confirm for sure in a few weeks, hopefully, when my boxes are built!
I have the recommended cut-out sizes for each of the 18" SI HT drivers in my PPSL build (16.7" diameter, IIRC) and both seem fine.
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