No engine bay? I call shenanigans! Looks like someone else felt the same as I do and modified those deck plans accordingly:
http://www.myth-weavers.com/showthread.php?p=3502854#post3502854
(Click on the "Show Top Deck", etc. links to show the images.)
No engine bay is actually better and makes a lot of sense.
Short of it, its an artifact courtesy of Star Trek. Star Wars craft have multiple engines, so if one goes out they can fly on the others and make repairs on the ground like a sane person, or send the astromechs out if it just can't wait. You never call shinangans on a 737s lack of engine access.
The whole " engineering is totally required" comes from treks need for a "technology room" to do technology things in. Really stupid when you think about how often they fiddle with an unknown or experimental device LESS THEN TEN FEET FROM THE ANTIMATTER REACTOR CORE!
What could possibly go wrong with this device next to that antimatter core.
On the falcon they had to pull up panels and dig into the guts from inside. but no engine room.
Edited by Daeglan