Hello Something I feel, is that there doesn't seem to be much reason to build small things. Like, if I wanted to build a space probe to fly past Duna, then I'd have the probe core and the antenna, a girder segment to stick some solar panels on, the batteries, the instruments, and then a small fuel tank and small engine. Launch it into space with first stage to get out of atmosphere, second to set course towards Duna, and the probe's own engine for any course corrections, to maximise mission time over Duna. But, looking at the various craft other people have flown, it seems like it's easier to build a colossal deep space probe, with all sorts of extra doodadery on it. Multiple science modules, huge batteries, all that sort of thing. Like, in my thread about mun rovers, my rover seemed to be a lot smaller than the other things people had built. e.g. for rovers, does anyone even use the smallest wheels ?