I think, to have a mod contest is a good idea. It could help the entire ROG community to a higher level - not only by participating but just by watching too. It would be a great inspiration for all of us!
However, if you are calling it "contest", it has to be fair! Comparing the works of amateurs with those of pros would rather create frustrations and disappointment. Creating different categories, different levels for the contest would be a nice way to satisfy everybody.
First of all, modding and scratch building must be completely separated, the work invested in them is very different. Also, when we are talking about modding, we can realize that it has different levels. Removing a hard drive cage from a default factory setting is already modifying the case, as well as cutting a side panel window or adding additional panels to the build.
So, my suggestion is to make at least 4 categories for modding (scratch building could be the 5th category):
1. basic (removing/changing case components like drive bay cages or case feet),
2. moderate (do some cutting or minimal paint work),
3. advanced (serious modifications: redesign existing components of the case or design completely new ones) and
4. pro (all of those modifications made by people whom make a living from this)
I am not sure, if the 5th, scratch building category needs further divisions. Who can make such things, those are the real pros!
I saw that were discussions about the components too. Well, I think the only restriction here should be that the build have to be functional - and, maybe, has to contain Asus ROG parts (since this is a ROG forum). Taking in consideration the level of the parts (whether they are the newest or older) would exclude the individual inputs of the builders and would make this contest restricted to the money question- anyway, the the big companies have their own contest on who is making the best parts.