-Sorry no pictures...
-I attached the fat wire to the tuner ground using a normal crimp terminal - yellow one with a small ring.
-Just a standard automotive relay - needs to be rated at least 30A. Wire the 12v-ve lead to one side of the Normally open contact and the 12v-ve to the transceiver to the other side of that contact and power the coil from the 12+ve lead from the cct breaker.
I'll post a diagram.
12v -ve goes to 85 and 30
12v -ve to your transceiver to 87
12v +ve from the SSB cct breaker to 86
switch the cct breaker off when not using the SSB