For anyone who is interested, I have finished my adjustments to the TRC to make it fit. It was a pretty simple process, I enlisted the help of my dad (as he is currently redoing his bathroom so he had his drill ready).
Anyway, we used a 2.5mm drill bit, which was slighty smaller than the hole, but a 3mm one seemed slightly too large.
First, we tried putting the Tokai cover on top of the Gibson cover, lined them up so the hole of the Tokai was over the hole where I wanted it on the Gibson one, then drilled through. This wasn't the greatest way of doing it as we were pretty much drilling blind.
What we did finally was to start drilling inside the existing hole and move upwards into the plastic. This took a few goes, and we also filed down the bottom of the bell cover slightly.
It was basically a process of trial and seeing how it goes, with pretty much no error I'm happy to say.
Anyway, got a couple of photos of the process, unfortunatly in my eagerness to check if it fit, I screwed it in, so I don't have a final photo of the actual modified cover on it's own.
http://i76.photobucket.com/albums/j33/snakeseries/tokai/DSCF4010.jpg
Before headstock
http://i76.photobucket.com/albums/j33/snakeseries/tokai/DSCF4019.jpg
Comparason of the two covers, click the url to see it more clear
http://i76.photobucket.com/albums/j33/snakeseries/tokai/DSCF4022.jpg
Work in progress
http://i76.photobucket.com/albums/j33/snakeseries/tokai/DSCF4024.jpg
Headstock after, looks much better I think