So i finally toke my time and finished my project.
First of all i followed Eric´s guide to shairport second i followed hunternet93´s guide to make a wireless hotspot out of your RPI
When you are finished with both of above - You are 90% of the way.
My RaspBlaster ended up looking like this.
In the lid i installed a 5000mA solarpowered battery - Workes like a charm!
Thanks to Eric and Hunternet93!