Tough question - how much of what you're doing was predicated on your ability to make the parts fit on your own initiative?
If you bought it as a finished, consumer end-user solution, I'd expect customer service to make it right, or at least point you to a smith capable of doing so, or offer a refund, unless your initial sales declaration was that you could do this without assistance.
If you bought it as "experimental" or "iffy", then it's up to you and/or your guys to make it work for your platform, including custom shims or alternative upper lapping.
I've bought experimental systems, where the final fitting of parts and pieces was up to me and my ingenuity, meaning source-local site alterations are OK for individual installations, and not the responsibility of the system originator. Commercial offerings differ in that remedial regard.