Paul,  The aluminum plate is the actual rear pan plate minus the rest
of the pan.  Once you know that the rest is self explanatory.  I hope
to finish the fixture  this week end.   Thus far it has been fun, a
lot of variables to control that keep me on my toes.     Jerry

Looking good jerry. Make sure you don't put it where an
oil pan bolt goes. I guess you could always notch it out
for the pan bolt.