I would recommend building the ship with each floor vertical, so that thruster plumes are facing the right direction. (Effectively, if you stand on the ship with "normal" gravity, you'll be standing on the "bottom" wall of each floor.) Then, set up gravity blocks, rotated to point "down" aft. That is, the "in-flight" gravity blocks will point rear-ward. Then you can simulate thrust-gravity by simply activating one of the rear-facing gravity blocks, so that you can stand on each floor normally. Once you are in that gravity mode, you won't even notice that you are "walking on walls", because you'll design the interior so that it feels like you are walking on the floor. Block rotation will be critical at this stage, to make each "floor" look right. Just for completeness, you should make your stairwells traverse-able in either gravity mode. The display blocks will display text sideways, but to me, the thruster plumes are worth it. I developed this method while building my "
Clarke Explorer" ship, which is designed to look like it uses thrust for gravity as well.
On a side note, I think the display blocks can display unicode text, and I think there are side-ways letters, so you can write on your display blocks so that they appear to display normal text under "thrust gravity". Has anybody tried that yet? I'll see if I can get sideways text working. If not, you may have to use extended characters to build your own sideways font. (Could be cool!)