Hi Mike
I assume the EQ6 has a Vixen style dovetail?
All you need is an aluminium mounting plate, similar to
this example at Scopestuff which has dimensions of 3/8" thick, 6" x 16" (9.5mm thick x 15cm x 40cm).
You can then attach a dovetail adapter to the underside of this plate; Bintel sells an
Orion Dovetail Mounting Plate 08" for $39.00. Just make sure you can fasten the lock knob on the EQ6 that clamps the dovetail, without fouling the aluminium mounting plate.
In the good old days, I made various mounting plates from 12mm plywood to hold side-by-side cameras on my Vixen GPDX mount and this worked fine. Wood is much easier to work with and when varnished to protect it against the elements, proved stable enough for camera/lens photography. The longest focal length lens I used was 400mm and I could get 5 mins unguided. 200mm gave me 20mins unguided. All 35mm film of course!
Cheers
Dennis