So I realised that there is an official fog filterpostprocessor and immediately decided that I need to test it out. After very little adjustments my nebulas now have volumetric fog which brings them so much more to life. I can't believe how well it fits...
This is about as thick as I made it go, of course it changes depending on how deep inside you are and disperses as you leave the cloud.
Thank you @nehon for making this awesome filter
I've also made a new model for the laser cannon, this time a sphere based one so it can rotate and follow your aim and also fixed some aiming code which was way off.