I assume he did not do any type of bearing clearance checking as he did the assembly? That one has all the earmarks of too-tight bearings that ran out of lubrication and seized onto the crankshaft. He's probably ruined the crankshaft, or at least it will need to be reground undersize to smooth out any damage. I never assume anything about an engine assembly- - - -everything is wrong until I prove it's right to my own satisfaction.

Do a full teardown and inspection- - -even to the point of pulling oil gallery plugs and running solvent-soaked rifle brushes through all the passages. All it takes is a tiny bit of dirt or a few metal particles to start a cascade of damage that ends up with a locked-up engine. There's no sense in trashing the whole engine over a little damage, but don't repeat the same mistakes that damaged it in the first place.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!