OK, I finally just bit the bullet, and came up with this :

Hopefully, the wiring is correct

The reason for the odd shape is this allows the finished board to go through the tweeter opening when the front baffle is attached.
It's a bit of a squeeze but just makes it.
It fits nicely between the two baffles behind the tweeter, with minimal interference to the internal (I think

)

Is there any reason not to use this same setup on the A/V-3 towers ? Like this:

I'm happy to finally have gotten over this hurdle (I hope)
What a painful process it's been!
I'm looking forward to moving on.
Thanks for your help Danny

Cheers, Scott