The "flip counter-clockwise to match the Gamba drawings" piccie is just the IIsi Nubus Adapter and some nondescript Thick/ThinNet Card.
If you'll notice, it's to be mounted to the SE/30 slot in a component side up orientation, so that ALL SIGNALS pass through in the proper order!
You'll need to remove the RA EuroDIN Male PDS Connector and solder a straight-up EuroDIN Female Connector to the IIsi Nubus Adapter. Then that'll plug into the Machine Pins soldered to the bottom of the SE/30's PDS.
If you replace the straight up NuBus Connector on the IIsi NuBus Adapter with a RA Connector, the NuBus card will lie flat, but pointing its @$$ END at the front bezel. If done this way, then several SE/30 a/o IIsi cards could be stacked underneath the IIsi NuBus adapter using EXACTLY the same modification processes!
Make full scale cardboard mock-ups of the cards, fake up some keyed EuroDIN connectors (maybe outta foam or corrugated cardboard) and play building blocks!
A scan of the /30 logic board at 100% would be VERY helpful to me if you SE/30 clowns'd like to tilt at NuBus Windmillss in yet another Quixotic Hackin' Quest, otherwise, I' goin' back where I belong.
< attempts to make a graceful exit before either an SE/30 Cult induction ceremony or a friggin' SE/30 Purist lynch mob has a chance to assemble . . . sigh . . . >