Was there ever lighting in those cases? if so, you should be able to run the wires out the same holes. I have a 3.0 double and just bought long led tape and started from the bottom right side and ran up the front pillar through the top and back down the left side. Can't remember if I had to drill holes though.
LED strip is the way to go. Trim to fit, cheap, simple install and multiple color options out of the box. I just did my daughters bedroom and it works great. I did my case with fluorescent only because it had all the existing fixtures and only required one new ballast. If i was starting from scratch, LED all the way.