I installed RotaryCraft last night on my 1.6.4 server and oh my - it's a huge, all-encompassing mod. It has approximately 6 different ways to produce power, has its own ore double/tripling system, several tiers of shaft/gear-based power transmission, and its own crude tanks and pipes. It also has its own auto-miner system, among many other things, like armor, tools, weapons, etc.,.
It converts to/from MJ and it looks like it converts to/from electrical "volts" - not sure what mod that's from/for. It also accepts BuildCraft liquids and has its own fermenter/still-type setup to produce "jet fuel", which is a high-end fuel a step above BC fuel.
Where it falls short, IMHO, is power transmission and tanks/liquids. The spinning torque * speed = watts shafts are a bit unwieldy, mostly by design. Think of a direct-drive gear mechanical system rather than "power bus" electric-type system used for EU, UE, MJ, and TF.
If you haven't tried or looked at RotaryCraft, I highly recommend downloading it or at least looking at the videos.