How hard would it be to replace the cast iron outer parts on a Harman Accentra with brown enameled parts? I currently own a cast iron Accentra model from 2006 that works well. I found a 2003 brown enameled model for sale at $1200 and am thinking I would like to swap them. The brown model has some non-working parts, auger motor I think. Would this be an easy upgrade? I tinker with my stoves now and have serviced everything on them now; from annual cleaning including fan rebuilding to ignitor replacement. Anyone try this at home?