The problem with that is . . . no it isn't.
The reality is that this building is the Starcruiser, but that's not what the guests are meant to believe. So you need to provide them with a plausible alternative - like that there is no building there in which the Starcruiser experience could be taking place. Or that if there is, at least you're not seeing any evidence of it.
I bet you zero out of 1,000 people will see the Starcruiser warehouse and go "that must be where they house the supplies for the little Shuttle that takes us to space". No, it's obvious what's really going on there, and it ruins that part of the illusion. Of course most guests know they aren't actually going to space, but the entire point of this sort of enterprise is to remove all evidence to the contrary. A real cruise is one thing, because the lame buildings at a cruise port are 1) necessary, and 2) not the actual site of the event. Your cruise ship is plenty more appealing, and I bet most people focus their attention on that. But the Starcruiser doesn't have an actual, compelling, on-earth focal point for guests to be distracted by on arrival, so you've instead got to whittle down what they see to only things that support the idea they're about to start an intergalactic voyage. Big white boxy building doesn't do that. It's clear what the truth is.
As is true of any attraction, you have to make it easier to believe that you're on a great adventure than it is to believe you're ping-ponging around a warehouse. The easiest, and most basic way to do this is . . . to hide the warehouse. Otherwise the guests' immediate impulse will be "that must be were this thing actually takes place". Way to spoil the fun before you even get inside.
The same is basically true of taking guests past the backside of Galaxy's Edge on their approach to the Star Cruiser. You're paying 6 Grand for the most mega-Star Wars adventure on earth, and you're making us see how fake it all is before we even start?? Couldn't you take us the long-way 'round through some trees or something? Goodness.
Have SOME sense of Showmanship about this, Disney.