Theres a problem. All Wizardri islands are only 3 layers out of the water. I'm not really sure how we could lower this if we wasnted to add it.
We could probably make a baseplate ground and use zonebricks to put everything below 3 layers underwater.
Hmm... Ok. Yah, I'm not sure if there's really anyway to bring them to the same height. I'm thinking this particular build may not work just because of that, unfortunately. Also, it's 32+4 mod terrain high, the level is quite a bit deeper than what you have built.
I'd love to help with Wizardri. I will note, however, that my parents were not too happy about the amount of time I was spending on my computer while I was working on this, so work for this and any work I could do for Wizardri would likely not be as fast.
As for the large flat spaces, I know, and most of them either have been filled in, or will be. This is still a work in progress.