I may as well talk a little more about it. I single-handedly ported MinecraftForge to 1.8.1 (although there are a couple outstanding bugs that mostly don’t effect RedPower), and then I temporarily ported the client side of ModLoaderMP.
Overall it seems to be working pretty well. I have to come up with a new Wafer recipe, since that one is now occupied by the stone bricks, but the rest seems to be working.
Currently it’s SSP-only, mostly because ModLoaderMP hasn’t updated.