Hi David,
Not sure that you'll find the detailed plans you are after. Albert Highe gives a good explanation of several 3 pole designs here:
http://www.ultralightscopes.com/Links.htm
I built a 10 inch travelscope earlier this year. What I did was draw the parts out on a free CAD program. Another iceinspace member then kindly CNC routed the parts for me. It was pretty easy to build that way - almost like putting together a jigsaw puzzle. I had built a few dobs before so that experience certainly helped and Bruce spent quite a bit of time making sure he understood what I was trying to express in my drawings.
Can you say a bit more about what you are trying to achieve with a travelscope design? Airline carry on? Something to fit in a small car?
Those kind of parameters help identify what compromises you may need to make. Travelscopes are usually compromise instruments. You often take shortcuts to facilitate breaking it down into a smaller package. For example in mine the top of the mirror box unpacks and becomes the groundboard. It's compact but the scope feels a bit 'springy' when it moves as the groundboard is smaller than on a conventional dob. I also truncated the altitude bearings so I cannot observe below 30 degrees. Again this was to save space when loading it on an aeroplan.
Rod.