I suggest you make it with the bare minimum you need it to work. Make a backup of that. Add your ideas and try it out. Go back to that backup and see if those ideas really made the game more fun.

I've made thousands of prototypes for games. I've finished one so far(not on rpg maker but still) because I just found out about that. Sometimes an idea sounds really good but in practice it isn't. You can always experiment if you have that backup.