Looking for examples for Orienteering Problems with Time Windows and Working Time (Breaks)

Hello everyone,

for an university project I have modeled an Orienteering Problem with Time Windows and Working Time restrictions (Breaks). 

As a total newbie I have major issues implementing the model and time is running out. I guess it would help me a lot seeing some other programming approaches. Any chance you know where I can find some existing implementations?

Thanks a lot!