I can't start the game with the alpha version 1.7.10.
In the first test, I had a problem with the Thaumcraft API, error associated with an armor of the mod apparently.
On the second test, it was buildcraft API that was the problem.
I've that mods installed in their latest version.
I did not try any further.
This could possibly be fixed in the release version?
I'm so haste to try Rotarycraft!
These issues are todo with changes in the API's that Reika is building his mods with compared to the versions of the mods that you are running, im sure this will be fixed by release, if you want to try it right now, open up the Reika.jar with any zip program, go into the api's folder and delete the Thaumcraft and buildcraft folders, that will fix it for now