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I'd recommend asking to speak with Amy at Waltly (she was my point of contact and excellent) there are a few of them in the customer service team and I believe you deal with the same person throughout the build. They can recommend tube types and diameters but equally you can send them what you'd like. Quite a few titanium frames list exact spec so you can get a good idea. I largely went with their recommended tubes and then sense checked them against other frames.
It's good to try and have a pretty good idea of what you want from the frame before you email them, try not to make loads of changes to spec as you go to save confusion.
I've emailed them to start the ball rolling. My main concern is knowing how to spec the different tube types/diameters - the combination of these is pretty crucial to ride feel. Do you get these options and if so, how did you go about deciding on these?