My portable radios have built-in SWR meters and I figure it's better to tune for a minimum with the meter in the radio than one in the tuner - that also made the project simpler.
I think there might be an elegant way to mount the toroid on the back of the 12 way switch with the windings looping around each of the terminals but I'm not quite there with this initial build.
Here's a close up.
In the back yard there is an end fed wire that rises up to the top of a 6m squid pole and then angles over to a pole on the roof of the garage. I guess it's about 12m of wire. A counterpoise runs along the ground under the back deck.
The box worked well for a project like this, it was easy to drill but strong enough to hold things like the switch without flexing.
The tuner worked well on 20m with a deep dip in SWR but a little more inductance (more turns) is needed for 40m.
As mentioned, I'm working on a neater wiring system for the switched toroid. This is looking better: