Welcome again, @RBQ.
Well, I should share..., (been just slow at posting a thread on this...) but..., A friend on the Phoenix site helped me WOPL my Carver Corp., C-500. Very similar to the PL400, but with an extra row of transistors. Fun project..., if I ever get spare time to organize all the photos, I may post a thread. But, to be sure, a WOPL C-500 is one rare and interesting piece in my collection.
WOPL folks were very good to work with. ...oh, and yes, don't forget the DC Protection module... 😉
OK, realizing I'm the kettle calling the pot black, here..., a photo of proof that my C-500 WOPL exists...
Looking forward to seeing your photos of your rig, too.