Wow, that launchpad is hard to destroy. But I found a weakpoint during my experiments (I even repeated to make sure it wasn't a fluke, it's reproducible with this craft).
Anyway, here is my entry: http://imgur.com/a/PTDZX
2050 total, no nodes unlocked. Because there is no decoupler, this is 2 launches, with the appropriate solution for the obvious issue with that