MV:
Don't you have any plans for the job?? (by an architect or PE)
My 2 cents, as I don't know your location.
The PVC should be OK within the floor, and a "reasonable" stub-up, and then convert to required conduit.
RGS couplings & connectors are available in compression and set-screw, and we have had no problems with them, when we use them. A threader could be a good investment, there are a few "manual" ones available for <$400.00, and don't forget the tri-stand.
Best suggestion, before you get into the job/bid, talk to the AHJ. Or, talk to the architect/engineer.
John
