Thanks! 
Probably not in the initial release unless the kickstarter is just insanely successful. We have no major source of funding yet and the focus of Galaxy Heist is on boarding other peoples ships during large pvp space battles.
Focus is on the battles themselves more than having tons of space to explore like in Elite D. The interior maps of the large spaceships are instanced off of the exterior space areas where the larger battles take place. So boarding another ship in the battle essentially pauses the location of those two ships and takes the people on both ships into the interior map of whichever ship was disabled/boarded.
As far as boarding and main combat goes, no, for the reason explained above. However I plan on making a second game mode that would see the ship simulating movement while running around inside, so the longer answer to this is yes but I’m going to wait until just before kickstarter to talk about that specific game mode
I think this was also answered above. For a ship to be taken over and boarded it has to have been disabled in space combat first so this wouldn’t be an issue.
Well of course, the outside is always getting shot up and hit with space debris