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Thanks for your interest, Norm.
I have ended up deciding on a 20" at f/5. I observe with Gary Kopff, so I will get an Argo Navis direct from him (with personal training session!). I will wait a year or two until I have the $$ for Servo cat, which is several thousands more again. I am getting a CR2 moonlight focuser, but will no doubt upgrade that down the track.
It makes a lot of sense ordering from SDM. You save $1500+ in freight, and many of the key components are the same.
As for the smaller end of the truss dob spectrum, I know that SDM advertises as making only larger dobs from 18 to 30 inches, but it would be worth giving Peter Read a call to sound him out regarding making you a 12.5 inch. Just make sure he doesn't get distracted from making my scope first....
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