I had planned to copy Geoff and use a hand drill as a steering mechanism. I ordered a drill on eBay but when it arrived realised that the pinions were aluminium and I thought they were unlikely to last long. So I put a request out on Freegle and was offered a drill. This turned out to be a lovely old Record drill - too good to cannibalise. I got chatting with the guy who had offered me the drill and interestingly he is building a plane in his garage. Anyway, I decided to try the angle grinder idea that Rhys mentioned and am pretty pleased with the result.
Also, roughed out the main formers and the floor so the CK's shape is starting to emerge. A good day.