I added light strips to my Creator Pro, which makes it MUCH easier to adjust things inside. You can actually see what you are doing. It also makes monitoring your prints much easier.
This is wired straight into the 24V outputs of the PSU, and I put a switch on the front as well.
These used 24V LED strips from Jaycar.com.au and about 3 hours of soldering and wire routing.
To build something like this you will need to be confident at soldering and working with medium voltage DC, and fully understand the risks of wiring up circuits like this. If you don't know what you are doing you WILL damage your printer, motherboard or yourself.
Ignore the STL its just a placeholder.