If you want to do it yourself, consider the Approach Fast Stack Pro Hub product. It is a customized wiring hub and wire harness set for just about any combination of products you can come up with.
After you have selected your panel components you just tell the knowledgeable folks at Approach Fast Stack what you have. They generally know and will advise you how exactly you want them connected for specific functionality, or will follow your instructions.
You will get a hub and wiring harnesses for each component. The harnesses will all connect to the hub where all/most of the signal connections are made. You will also get complete detailed documentation of how everything is connected (extremely useful down the line). If you later add or change a component, a new harness can be supplied that will simply plug into your hub.
I flew my '10 back in 2011. I never regretted any aspect of going with the hub. All that's really left for you to do is connect power pigtails to your electrical system (and doing the rest of the electrical system). It eliminates a massive amount of work while still leaving a satisfying amount of work to do. Having a Stein or Aeroelectronics do it is one way, this is another way at a lower cost. I've always wondered why more people don't go down this route.
BTW, I was going to have someone cut my panel for me but I found that with a grinder, drill press and hand files, the job went quickly and easily. Very satisfying! The key here is to do a good layout.
I worked a bit with Stein and Aeroelectronics - both great resources!
Here's a look at my (aged) panel:
Kitlog panel page