Manufacturing large mill components is partly an art. However massive, these components do distort, and must be properly supported.
Foundry casting, welding distortion control, and machining, of these large pieces takes experience, proper tools, and proper planning.
Shops have different strengths and weaknesses, associated with both component materials and experience. To get the best possible product these must be understood, as well as, any international/cultural differences. We can offer advice, based on 35 years of foreign shop experience, how to choose the proper shop and how to help obtain the best product anywhere in the world.