Haha, my problem solved i didn't put mod folder into the GameData but folders from it (i mean parts, resources etc.) into the game folder (me stupid >.>) The weird thing here was that i was able to use cyclotron, and other parts but not experiment modules. Waiting for more modules and models for them I would suggest to change sizes of parts that around 30, 40 tons. They should be much bigger if you want to keep their weight.