[3.5] Planewalker class?

[thirdkingdom]

Hey,
I've been thinking about creating a class that allows even low level characters to travel to other planes through physical movement, in a way similar to the Amber novels. Such planar travel would be based on physical movement (taking a fair amount of time) and would be restricted to coterminous travel; a character would have to progress from one adjacent plane (or layer) to the next. The ability to do this would not necessarily convey any immunities to local conditions, and the character would have no ability to actually manipulate their surroundings (unlike Amberites Shadow walking)
What are your thoughts? Has this been done before?

Todd

[Zangano Athyran]

One thing that may help the creative process is to check out the Half-Janni template (Sandstorm). It has a "Planar Jaunt" ability that perhaps you could modify as a base.