The final illustrations:
The renderings are 5000px wide, plus a lot of additional work in Photoshop the last psd-files were around 1GB. It took around 10 minutes to load a single one. My next system needs definitely more RAM...
And at last, some close-ups in the original resolution:
To be honest, I was very sceptical if I could handle this unusual topic. But now I'm quite happy with the result and because it was my first published and paid work I've ever done, I finally think this project was a rewarding experience.