I was thinking: what if you made a hybrid system, running the plutonium in a CRCS setup (for better efficiency), while using some of your thorium as cheap neutron reflectors? Something like this. It has the advantage of avoiding the extortionate costs of iridium neutron reflectors, and it shouldn't overheat, but i'm not 100%. I can't try it on the computer cube since i'm not on 1.5.2 yet, could someone who is test it?
I had a similar idea, but I don't know if regular vents can keep up with the thorium + 2 reflectors in the latest update. If it can... awesome. Otherwise, upgrade to OC vents.
Right now, I'm running with my Private Public mod pack, which doesn't have IC2 in it, much less GregTech. Between the updates and the bugfixing and config file tweaking (particularly on the forestry backpacks to store all the type-appropriate mod items), I haven't had much of a chance to do any testing in my IC2 testworld.
Having looked over the GregTech recipes for solars and other options, I find it amusing that nuclear is now the cheap option. That should be a meme... Gregtech: Where Nuclear Power is the cheap option.