Crankcase Repair

[Chris KC]

If you're really determined to keep going with that one John I guess a skilled welder could sort it out.
In the old days it would have been patched most likely with a plate and a few bolts (after drilling out the ends of the cracks and removing anything liable to come loose).
That's a fair big area to patch though.
Given that it already has a large welded repair I think you need to be mindful of potential distortion / alignment issues; and look carefully for other damage you may not have spotted yet.