Crankcase machining ???

[Malcolm Parker]

If the crankcase casting is on Ebay, I would suggest that it has very little value as the cost of having it machined would almost certainly exceed any value when finished.   As Dave mentions, you wouldn't know whether it was all okay until it was finished and by that time you have spent a huge amount of money on it.
It would make a good doorstop.
I am sure that Charles P put several hundred hours into machining his case.