I rewrote the code from scratch attempting to recreate the original as close as possible just by playing the original (and by watching longplay videos). I didn't have any access to the original source code.
Viewing post in How did you do this?!
Here you'll find the original sourcecode (68k Assembler) and all the sprites, GFX and Music of Turrican 3 (Amiga).
http://ddl.to/d/3Szaq