I'm sure you already know this, but on the Manfred Trenz Fanpage (This sites affiliate) there are maps to Turrican II. The reason that I posted this is because I've got a question about a secret area on Level 1-2 (Picture at: http://www.mt-fanpage.de/english/tur_2/tur_2b.htm)
On Level 1-2 there's a region that you can reach by spinning as a 'ball' and drop down the waterfall. In there you can pick up alot of diamonds. When you go to the left, you can go up along the first waterfall to get back. Instead of going up, the map says you can also go left and pick up a couple of extra lives.
I can't remember this being in the Amiga version of Turrican II. Is it there aswell?
PS. I'm now desperate to play that game again! But I always hate it when I miss so much extra lives and diamonds on that fast flying level 3-3. :/