8.97 payload 56.43 ship mass at launch 15.90% payload decimal 5 stages (initial + 4 drop) Drag coefficient shows up as .197 because of mechjeb on the payload. I hope that's not disqualifying considering you did say we could use mechjeb. I used a similar design to Scott Manley's ship in this video. I'd call it Donkey Kong staging.
There's a few extra images of moar boosters in the album.