Should be "doable". Extractor mods, because of the larger size of the SAUM. Is your plan to feed it in BDL style or with magazines?
I talked to Stiller about this on a LA, not that it should matter, with a standard bolt face that I was considering having opened up to mag bolt face and they told me it was a no go and it would cost $500 for a new bolt. I didn't see it as being cost effective so I left it alone and used a Rem 700 LA with mag bolt face that I already had.
Any time the 'plan' is to take a receiver that's set-up to handle standard, non-magnum cartridges and convert it to a magnum, these are questions worth asking. The interdnet makes it sound 'easy'. It can be damned time consuming! You need a good understanding of the feed cycle before ever beginning. A quick look at the instructions that come with Badger M-16 style extractor says the cuts are the same for .473 as they are for .532. Just the extractor is different. Both are made over sized and require 'fitting'.