I owned JD, and LED OCD is a must on all games it supports. I installed LED OCD on JD, and of course it looked great. Make sure you use normal LEDs, not the non-ghosting LEDs. I used superbrites... kits are a waste of money IMO. Just grab a shitload of cool white, blue, and red. Experiment with what looks best. I don’t think GI OCD is necessary. LED flashers are a personal preference, but I prefer them.
Installation is easy, and Herg is a breeze to work with. Tell him I sent you and he’ll probably include some Legos at no extra charge.