Hacking Ocarina of time sounds Both challenging and very interesting, it was a great game. I have it installed on my Kindle Fire and have been playing it recently (with a blue tooth controller), I have the original cartridge and played through it several years ago on original hardware. It was one of the best N64 games.
I noticed you mentioned that you increased the difficulty of the first area (Deku tree), increasing the difficulty too much can ruin your hack for a lot of people (just felt the need to mention that). Most people want to have an enjoyable experience with varying degrees of difficulty. If you're not sure what I mean you should spend some time playing some of those ultra hard Super Mario Brothers hacks and see how long you play before you quit and move on to another hack.
Good luck on your hack, if you get it to a completed state I'll be one of the first to give it a try!