Sorry I couldn't answer the more tech questions.
I went to ask my friend by email who designed the Amiga A1300 DVD, he replied
It was only that I came across someone selling an adapter for attaching Laptop CD Rom's etc
to std IDE leads, that gave me the idea. I was totally bored of boring old PC-A-Like Amiga
Towers, always square and beige. Plus all the extra space they take up. I wanted to build an
Amiga that had all the Tower had but still kept it's look and feel.
What drivers did I use??? I can't give all my secrets away ;op