Just got off the phone with Rapid City, I should have plates and stickers end of this week or beginning of next - they will go out tomorrow. They'll be good through July due to SD expiration scheduled based on last name. I'm betting I will have to renew out there unless the reconstructed brand disappears, because it'll be about 4 weeks to get the title, based on 4ish months to get through a salvage inspection.
Process was completely painless to run through South Dakota. Weight slip, exterior photo, affidavit of camping equipment notarized and emailed in yesterday completed everything after having mailed in bill of sale and title and reg/title papers about a week ago. Just over $400 to register till june including my tax on purchase price.