FYI The Williams Precision sights are back in stock.  I placed an order, knowing it was backorder and thinking it would take a month or two to clear the backlog.  Nope.  Muzzle-loaders.com must have received a shipment that same day because my order was processed and shipped the next day. 
That was fast. The William's Precision sights went from backorder last Thursday when I placed my order, to shipped on Friday, to at my door and on my rifle today. 
For my CVA Accura I followed the GoHunt instructions of basically making your own front globe and crosshairs as this Williama Precision sight kit didn't exit then.  Put this William's Precision on a different CVA today. 
This William's setup is SO much easier to install.  Two screws and a couple minutes to install. Far easier than the other method. So both muzzies have similar peep and globe with crosshairs setup. I have just the one Merrit adjustable peep insert so may need to pick up a second one of those. 
Need to get some new GlowOn gunsight paint as mine has dried out. But otherwise quite happy with the simplicity of this Precision setup.