Are these turbo cracks realistically repairable?
 

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Any suggestions would be great :)

They are '99 turbos, so I'd like to get them fixed ideally.

The first pictures looks pretty bad. If I'm not mistaken, the crack looks like it runs all the way inside. I would toss that and get a new one, or buy a decent shapes one for like 50-100 on the for sale section

It does indeed run all the way inside. The issue is, the housings on a '99 turbo are different to the earlier type, although I believe they are interchangeable.

I don't think the well defined shadow you see inside at the top is a crack is it?
If not then the cracks actually aren't that bad. the bottom one is nothing. I have seen and had much worse on my FD. I wouldn't worry about it. You might be able to find somebody willing to weld cast iron but it will just crack again pretty quickly. Run them.

it's a shadow but regardless, the cracking is extensive enough that i wouldn't bother even trying to fix it.

that turbo is soon to be a gasket eater.

Cheers guys - I guess I'll use '99 cartridges with my '93 hot sides then :).