I wish you luck with further case modding. The most creative, and sometimes fun, part, but also the most noticeable.
I hope you know that DOL-101 boards need a pretty steady voltage (around 12v) to run so you will need something like a 14.8 volt battery pack. And just a tip for you: If you end up with an NTSC cube and a PAL PSone screen make sure to S-Video mod it!