They are talking about the fact that your assemlbing a close tolerance motor in a messy, dirty and dusty environment and the fact that any environmental contaminents in the wrong places will turn the thing into a very expensive pile of scrap. I’m in a similar situation with the motor for my camaro, don’t have a good place to assemble it, so I bit bullet and paid Mark Atkins to do it. Was it cheap no, am I absolutley confident that he did it 100% correct yes.