Paul,  are you still sloping the sides of the oil pan to make it
narrower at the bottom?   Is the pan drain located on the rear
vertical face?  There does not seem to be room for it on the bottom
with the wedge plenum.  The drain from the PSRU cannot go on the
front vertical  face as access is blocked by the S-beam.  What
thickness aluminum on the rear face (rear strut loads)??.  What about
temp and level senders?  Something clever could be done on the back
face for a dip stick, I think.  I could go on but the state of my
confusion is now abundantly clear.  I would like to build one but not
another prototype.  Time to get it right.        Jerry

I would say it depends on the cooling arrangement.
For most under the engine rad configurations tapered
sides are the way to go. .125" thick on the back face for
rear mm brackets. All RX8 engines need deeper oil pans.

Looks like custom oil pans will be with us for the
foreseeable.