Please let us know how this is coming along.
As mentioned, cheat sheets only help so much. But I'd be interested in purchasing a set if done properly, purely for cosmetic reasons.
Check out
http://michael.peopleofhonoronly.com/vim/ . This is the closest cheat sheet to being useful, since:
1) it uses arrow symbols. arrows are a better visual cue than words
2) It shows Ctrl+key combo shortcuts, which is a lot more useful than showing uppercase/lowercase letters only
Backslash is noted as 'Not used' in most the cheatsheets, but it is the default mapleader key, used in command mode.
[ and ] is noted as 'misc' in those cheatsheets, when something more like 'jump to prev' and 'jump to next' would be more meaningful.
One bad thing about each of the cheatsheets you google for is that they don't always follow the correct English mnemonics that vim uses (e.g. H, M, and L is supposed to stand for Home, Middle, Last line of visible window... but the cheat sheets call it other names). If there is enough interest in this taken off, I'll volunteer to check everything with :h a, :h b, :h c, etc. to ensure the mnemonics are correct.
Misc: consider adding a 'Ctrl' legend on the caps-lock key, since it's common for hardcore vim/emacs users to map capslock to control in their OS (e.g. with setxkbmap in Linux, with autohotkey in Windows) to reduce key travel (e.g. pressing capslock+[ is easier than reaching over to the Escape key every time you want to leave the command-line mode, capslock+f/b/d/u is easier than ctrl+f/b/d/u for scrolling up and down).