They both handle gating well, but both sort of want to be center-of-attention mods and have drastically different progression rates. I haven't seen anyone combine them harmoniously yet.
Challenge considered... and rejected shortly thereafter because (a) I have absolutely no experience balancing anything, and (b) I would probably never get around to it.
Could be interesting if someone does manage to pull it off, though. You'd mostly have to gate GT materials behind RoC machines, since Reika doesn't like anyone messing with his progression, for reasons already stated many times in this thread. About all you could gate behind GT would be the raw materials used in RoC, of which there aren't a whole lot. So that's, what, iron ingots (gated behind having a pick that can mine small iron ore), diamonds (needs cobalt tools and a furnace or iron tools and electric machines in vanilla GT), tungsten (tungstate harvestability or the Extractor and silk touched redstone ore- best unlock those at the same time), obsidian (harvestability), some Nether resources (which GT already tries really hard to gate behind steel), sugar (maybe require sugarcane to be centrifuged?), and a whole bunch of things like sand, gunpowder, and dirt that would be quite difficult to gate behind much anything.
So that's a few things that would allow certain pieces of RoC to be gated behind GT machines without (hopefully) breaking Reika's ToS, but for the pack to work, many of the GT tiers would need to be gated behind RoC machines as well, and that can only happen if Reika allows recipes for things unrelated to his mods to be added to his machines, i.e. all the GT ores in the Extractor and Grinder, Pulse Jet Furnacing some of the high-tier GT alloys (kanthal or nichrome to lock out upgraded Electric Blast Furnaces, perhaps?), etc. Reika, would you be OK with this, or would it be look too much like the "favoritism" that you've said people would yell at you about?
