Over the weekend I managed to get the ballast sorted, with a couple of deviations from the original. The instructions said to use a 1lb bar attached to the bottom with screws, but I went for internal lead instead (I'd already made the stand and forgotten to allow for external ballast) and the model needed more like 2lb to get it floating near the waterline. Perhaps because I used balsa rather than the original specified deal. A quiet Saturday afternoon melting down old and damaged lead soldiers, all self-cast so no collectables destroyed in this exercise, into a home made mould. Health and safety was followed, I used glasses, heavy gloves, apron, tin tray on floor for spills. A change from chopping wood about. Sorry about the pictures, but my garage isn't condusive to decent photos, and I don't do this sort of thing in the shed.