I started a new career (after one too many failures I get frustrated and restart to forget about them) and proceeded with my day one science spam on the launchpad. After recovery, I thought, what if I tipped the pod over and rolled it off the pad for the KSC biome? Worked quite well and got the CES (crew/eva/soil) reports for KSC, then spent a little time spinning and flipping the pod around to see how far I could get it to go. Then I thought, 'what if I attached a heat shield (or decoupler for stock games) to the top of the pod?'. And so, I made my first home built, day one rover. It runs out of power halfway to the shore, so I had to walk the rest of the way, but it's a new day one trick for me to remember.