As you know Randy ... I've never answered that question in the forum. Not because I don't want to, but because I really don't know the answer. I've lost work from people because I refused to give them a quote over the phone.
There are people out there who will give prices over the phone. They're called "salespeople".
Any of you work for a retail ceramic tile outlet? They know how to price the material .. to a T. But do they know how to price your work? I doubt it. Even if they do a site visit it's still a gamble.
So bottom line ... decide what you need to make for the time you know it's going take, include material and misc costs .... and presto ... you've got an honest and fair quote.