I took a good look at the face plate today. I don't think that attaching the L00 backplate is the way to go. ErichKeane is right about blocking any attaching points. My plan was to countersink some flathead bolts from the front in the thickest areas, but after milling the back flat enough to attach a backplate, I would lose too much rigidity and there would be no do over.
So, back to my original plan. It is to buy a 4" × 6" rod.
I guess that cast iron is the right material for this, but I'm not 100% sure.
Could you guys share your thoughts on a material to use for this? It should be a fun project. This Old Tony has a great vid on this very topic. I need to watch it again to learn some of the details.
Thanks.