Most people who've played Final Fantasy and have used an RPG Maker have tried this. I'm going to say a couple things on the matter, as a previous user of the toolset. A: You better be really good with RPG Maker, because if its prefectly standard and you don't know how to rescript the program then you're going to have a dull JRPG that few people are going to want to play. B: If you're going to do this, you better have a really clever writer. Sex jokes and going into people's houses will only take you so far, you're going to need a writer who knows what they're doing and knows how to be funny.
Its the whole ZP: Webcomic thing over again, lots of people like to make their RMXP stuff, but there are very few shining gems in that scummy, and landfilled pond.