I'm a moron and cracked my block. Is this fixable?

Good for you for trying these repairs, I've often wondered why I even bother some days "how badly did I screw up!".

Mobile welding guys can come fix that, I have no doubt, but like others said bring those pictures to a machine shop and they will direct the welder how to fix it.

Fear not, you'll be back on the road soon, a little bit wiser and able to tackle larger things.

Learning sucks sometimes ,....