Forge for 1.7.4 probably isn't going to happen. There are some annoying issues with the base code for MC 1.7.2 (Which is why mods like Tinker's Construct, Reika's mods, and Matmos aren't really updating yet) and some major issues with the code for 1.7.4 (Which is why there is still no Forge for 1.7.4) that are likely going to be addressed in 1.8.
the crystal Heart is beautiful. really good job on the model. little things like this help make the game so much more interesting. i would love to have this as an actual health system. its perfect for minecraft.