I swear I read this section many times before! But could not understand...
I guess my brain refused to believe that it is possible to fix the bearing blocks and then weld the parts together and end up with perfect alignment...
Even hammering some 10mm steel plate to perfect plane seems unbelievable. Guess it depends who is holding the hammer or welding torch :)
Sorry you had to copy hole page from your thread!

All the best,
Toomas