This is a scaled up version of branchus' brilliant Mini Macintosh Quadra 700 Raspberry Pi case to accommodate Argon 40's RPi4 back panel connector boards:
I printed case body and lid in Prusament PETG Signal White and painted with Testors Dark Aircraft Gray - Flat (1226T) [seems close to original Mac color].
Power button was printed in Prusament PETG Jet Black.
4 M2.5 x 6mm screws are used to secure Ar1 boards, 3 M3 x 6mm to secure the RPi 4, and 4 M3 x 16mm to secure the fan. You will need to extend the fan power wires to allow for the lid to be removed.
I also made a custom Apple logo “Quadra 700” decal with clear waterslide decal paper and applied.
The author remixed this model.
Scaled up version to allow for full back panel connectors from Argon 40: