Wow, that looks sweet! Of course, we can always tweak the layout a bit - but the design looks good. A simple frame structure, with only one frame changing. And the menu should also be kept simple and small in order to reserve as much space as possible for the really important element - the actual text. No SoUlFaThEr-style GFX, hehe... I guess that wouldn't be appropriate for such a document.
Nice work so far! So if I got you correctly, you want to link the old / original documentation with the 3 menu buttons next to the button, right? And above, we add the new documents. Cool! Keep it up...
*edit* ahem... I just remembered that you asked what to do next - I'd suggest a first version of the chapters "waypoint types" and "connection types"? Or maybe explanations on the bot menu and/or the waypointing menu?