@xBonyx i already explained why ic2 classic is allowed.
@CubeWrench202. Another thing. yeah immibis could make the things compatible to each other. As much he wants. But the rule that makes everything compatible to each other is the MODID. And the mod who contains the id can use the addons. As long the whole people do work for the splitt (so supporting both mods at once) then it would maybe work. But then there is the Licence in the way and because the IC2 Classic version i try to create "can Replace IC2" the will be aware of giving a permission to release it.
I do not know how much controll Alblaka has. But as the original modder of IC / IC2 he should be able to give permission to anything (as long he did not put it so that the ic2 team can denie or have more permissions then him).
At the very least i should be able to make the mod compatible to the API.
I am still thinking of giving Immibis a version of it because he is the creater of ic2 classic (he did the updating and co).
Do not know how much i can expand the licence cage until it breaks. Simply i have to test that out.