I'm waiting for the enclosures to be completed so I can finalize the networks and then arrange for delivery to Don.

I think JBL Consumer not making the components available has pretty much killed any enthusiasm for this particular project. Given that they are in the Loudspeaker System business and are no longer in the Loudspeaker Component business I can sort of understand their stance. I'd personally suggest looking at JBL Professional components for any DIY projects.