I actually had real problems getting my crafts around the girder in the middle, or getting the girder out of the way before 0.21, but those quad-couplers just work wonderful, they bring that U-shape into your craft with only three parts. That reusable design is totally what I'm aiming for, however those engines do not have enough fuel for an actual takeoff, (TWR of 9, but only 15s burning time) so I'd have to mount the modules somewhere else to take them with me. At some point, I'd also consider an entire redesign of the cargo & crew module, probably when I'll try landing that baby on Laythe. Unfortunately, I didn't add counterweights to my rover. (As you can see two times in the video where it just tips over and "lands" on the module) I really should've tried out my design before I was heading to Duna with it, but I didn't figure out any way to try out my craft without messing with the launcher part. The arm is not made of RTGs, instead it's a 1m steel beam with four RTGs attached. Admittedly, your idea of using RTGs is brilliant, it's gonna save up some parts and reduce the lagg a little (that's also why I used 1x1 plates to mount the docking ports for the modules on instead of multiple small girders). I'll give it a try as soon as I get my next mission launched. Yeah, I already know that cockpit from Scott Manley's reusable space program... It's AWESOME. And I'm not directly iffy on B9 Aerospace, I just don't like having houndreds of parts in my KSP part list. If I uninstalled NovaPunch2, I'd install B9 for sure. I'd really like to take a closer look at your packaging tool. What language is it written in? I think it'd be a really nice idea to put that features onto a website at some point.