That's the same experience I had...
When I was done I was thinking that's it!? That's what's been scaring me all this years!?.. hopefully my 727 for my Power Wagon will make its way to my workbench this winter and I wouldn't let anybody else touch it if they paid me.. one thing for sure if you want something done right do it yourself that way you know every parts put in correctly...
And of course I'm not saying this Cope guy isn't great.. I'm just saying rebuilding a 904 or 727 is not rocket science and not even close...