Wow man you have had the same failure as i did but mine was not quite as bad.. i did not have as much shavings in the engine.
Did you use standard ACL bearings or Race series ? i used standard ones and got about 70,000km out of them before i took the engine out and pulled them down.
Mine spun a bearing too and the acl rings i got were totally shot on 5 pistons.. only 1 piston had rings that were not broken.
If ACL race series bearings do this then I might go for better ones.. one of my conrod bearings welded itself to the conrod took ages to get it off (it was the spun one)
Im gona drill a hole through it and hang it on my revision mirror to remind me never take shortcuts again...
cheers lemme know