The crankshaft is almost finished! It is not perfect, and I am considering making another one. But for a first effort (at a crankshaft machined from solid), it is not too bad. Actually, it was the second effort. The first one was binned due to a 3mm eror.
I made the job much more difficult by using stainless steel as the material. Stainless is hard, and must be machined with carbide tooling. Problems with chatter and tools blunting. The big ends needed thin tools with a lot of overhang. After my initial unsuccessful effort, a friend suggested the use of a Gibraltar toolpost, which certainly reduced the chatter. (thanks David M).
After an estimated further 12 hours of turning and milling, the crankshaft is almost finished.