Hi
It is great to find someone that has an Arburg C4. I have had one for about 15 years and make some small clear plastic lightbars for model police cars. This is mostly a hobby, but it is fun to turn out parts and make a little money. As you are finding out the most challenging part is making molds. My molds are very simple compared to what you have in mind. Several of my molds were made by using a 3X size pattern and a Deckel 3D pantograph. This is old technology but for my molds worked very well. I think the advise concerning very high speed/expensive machines is correct for the type of detail you want. Please keep us informed on how you make out making your molds, Good Luck
JD