It turns out that the receiver chip I chose for the first versions - the STA-120 may be nearing obsolescence, and thus may be difficult to find going forward. Fortunately, there's another option - the DIR9001. It's not at all compatible, but it does have the virtue of coming in a TSSOP-28 instead of a SOIC-28, so it's smaller. Of course, that doesn't benefit us a whole lot seeing as how the board is now the 38x59 mm size for the chassis. But if it turns out that the STA-120 becomes unavailable, at least there is a second choice.

Of course I can't test that design right now because they're backordered until next year.