I charge 7eur/h for my scripting service.
I will not only convert, but increase the performance if possible and give it a clean look.
If you are missing configuration for scripts, I will make them too.
I can also document all the custom scripts, functions and tables.
I have not seen you data folder, but I assume there is plenty of functions to rewrite.
If you have very custom server then it may take up to 7 days (300€)
However I can only give the actual price estimation after I seen your data folder.