To be honest I was thinking of doing what nub did with SH2 a little while ago but the problem is I myself can't even do all of the tricks (Horses/Alessa). And the more I think about it I don't really believe SH3 needs a full game tutorial as it is pretty straight forward compared to 2. But I don't know. If you want to make a tutorial I say go for it! It's not going to hurt in the long run.

Also I just remembered there's a Guides tab for each game on this site lol. It's up to you Nub but you could submit your video guide there for everyone to find it.