as for Fett/Slave1:
As I see it, if Boba and Jango are two different bounty hunters, that Slave1 should look different, as the Falcon could have some modifications, like Han said, that Lando (the former owner) hadn't built in/on to his ship ...
if on the other hand there is only to be ONE Fett - the colour-scheme could also change over 20-30 years, not just looking brand new and unweathered ;-)
and yep, the ramp should be seen, makes more sense for continuity