Removing and re-soldering ribs is beyond most gun smiths I've heard of. Tricky- have to remove all the solder from the ribs, then re-tin for soldering. Lots of 'time'.

There are a few fellows here who've made doubles from scratch and they know how.

Equipment is necessary for alignment and regulation. Wood separators? - doubt it. Steel separators that fit the radius is the way to go, I suspect.

Set of chamber plugs with lazer's would help with alignment, vertical and horizontal, I would think.