It seems like this mission is trying to urge the player into using multiple launches to accomplish the task given.
If that is the case, the problem I have with it is that there were no missions to intercept and/or dock two vessels together.
I would suggest to replace this mission with a simpler, ' Dock two vessels together in Kerbin orbit' and give it the 35 Science. Then, ' Dock and refuel a vessel in Minmus orbit' for 100ish science, and then a ,' land 200 tons' for 300ish science.
Use earlier missions to teach concepts on how to achieve the goals of later missions.