This is a mod I've been working on for literal years. I had the same idea as FyberOptic when he released his mod that loads 1.2.5 mods for 1.7.10.
I plan on updating ReTweak when I have it fully functional for older versions (1.4.6/7, 1.5.2, 1.6.2/4) on 1.7.10. I also plan on loading mods from versions 1.2.5 and 1.3.2, but mainly focusing on 1.2.5, as there were plenty of mods that are not updated to version 1.7.10 of Minecraft.
The source is not able to be compiled as I do not have my main libraries uploaded to a server. This will probably not change until I have a actual reason to do so (I do everything locally.)
THIS MOD CURRENTLY IS NOT FUNCTIONAL. AND HAS NOTHING TO SHOW FOR EXCEPT FOR CODE.