First of all, make sure you have a good ventilation, it does smell.
Second, If you don't want to run a PC (which I am using Windows everyday and I don't see why people still hates it) you can use Caldera instead of Onyx. Caldera has a native mac version.
All the RIPs are not easy to use, and none of the RIP has an RGB mode for the Epson S80600, so that means you have to start everything from scratch. By Caldera, it is easy, it takes about 30-45 mins to create a new printing environment, Ink Transition, Individual ink limitation and linearization, Total Ink Coverage & Profiling. Simple and easy. You might gonna have some hiccups but I think you will be fine.
Just stay with whatever canvas you need to print with, Solvant printer can print a lot of different kind of material and I do see people keeps a lot of shit which they will never use and at the end, used up all of the space.......
aaron