Congrats, that is one heck of a cross country flight, get a good weather brief, that area is not covered by many TAF and those can be wrong I have found many times when it comes to unforcast IMC. You mentioned not much room behind that ball hole for another instrument, you might want to check into a dynot portable efis that you can velcro to the panel, or the wifi or whatever apps for tablets that send an ahrs signal to it, and get a couple hours dual instrument instruction in real solid IMC in a plane with a six pack until you are very comfortable flying by reference to instruments, flying with foggles is not the same as being in solid IMC, you have to be able to look at the gauges and understand them and block out what the inner ear signals are telling you. The first time I shot an instrument approach in IMC I still remember it felt strange, but that feeling goes away once you understand how to interpret the instruments and fly.