Thanks for the discussion/opinions about this topic. Seems like I'm not the only one who wants to have the VAB on their mobile, great ! Next step now (for me) is, that I'm going to check out some coding tutorials about Unity because as far as I know it supports Android and iOS + most/some parts of KSP can be opened and shown with it. You, all the Kerbal Kerman fans, could write down some suggestions in terms of function, UI, etc. that the App should include. Again if someone wants to help coding just tell me. I have to warn you guys though that I can't assure a final app yet because I still know next to nothing about Unity coding for Android and iOS.