Once again the idea is sound, i did something similar a week or two ago, but sadly only decided to post the competition threads in the retro gamers social group, therefore seriously restricting the chances of anyone taking part and choosing freeware games from the remake threads instead, if you are up for the challenges feel free to join here :-
http://www.avforums.com/forums/group...ro-gamers.html.
With regard to your thread, if you are open for an opinion i can see a couple of problems.
1) There is less chance of someone owning the same game on the same system, the emulation route encourages people who may not own the original to play it anyway, therefore i think most people won't bother.
2) Like my thread everyone will need to take snapshots or screen grabs to confirm high scores etc, most people here just can't be bothered.
Like i said the idea is sound, i'd love for this to take off here and get loads of members involved, sadly other gaming and retro gaming only gets a small audience, best of luck with it anyway i hope you prove me wrong.