It is ready and I published it in this new thread.
Regarding the repository with the instructions, I made a final release.
Thereby I improved the Julia code to make it more flexible for vectors and tensors in different data types and added some safe guards to the Lazarus example program.
The latter turned out to be important in case the compiled library has issues. Now the Lazarus code tests if the library contains every C-callable function and if not, the program terminates correctly.
As I consider the task to get a step by step instruction done and as i was able to use it for a feature-complete real-world program, I treat this thread as resolved.