Here is what I've got so far for the themer's guide to WALTER. Its very much an early work in progress, both in terms of what's there not being finished or proofed, and what's not there being ...well, not there
It assumes a working knowledge(ish) of Reaper theming and absolutely no knowledge or experience whatsoever of code. For the pixel pushers out there...
It is intended for themers but should also be useful to users looking to do some theme tweaking. Your feedback is requested, both on the clarity and correctness of what is there, and what else you might find useful.