Connecting international-to-domestic at Oslo (OSL) - questions

[Traveller]

Hello. I have a trip coming up where I'm arriving at Oslo (Gardemoen) from
the UK and connecting just 45 minutes later on a domestic flight to the
frozen north.

This has all been booked through the airline and the arrival/departure
airlines are both SAS (SK). The SAS website (and other flight search
engines) show it as a permitted connection (that is, when I put in origin
and destination, this flight pairing comes up without any prompting):

SK802 07:20 10:25 London (LHR) Oslo (OSL)
SK4084 11:10 12:50 Oslo (OSL) Harstad-Narvik (EVE)

I'm not familiar with the new airport at Oslo, and understand it's a
single-terminal design, but this does seem rather tight. Has anyone made
this type of connection through Oslo recently? I know I'll have to clear
immigration at Oslo - what about baggage, will it route through to the final
destination airport so I can clear customs there? All experiences - rather
than speculation - gladly received. I have also put the question to Oslo
airport - but they will doubtless give me the official answer..

T