I had not realized the bolts were 8.8 either. Maybe you should consider offering the 10.9 bolts to replace the 8.8s for an additional cost. At that point my interest in this kit would only grow more so.
Going back to the bearings though - there could be many factors that would cause bearings to fail, so that needs to be taken into factor as well.
It seems like you've got a great start on this project and you've looked into quite a few things. After talking with you about this my interest has grown in what you have to offer. I will definately be looking into this thread as it progresses.