Goa'uld Ha'tak Mothership ortho

One thing I could never figure out - why did the makers of the show decide that Goa'uld Ha'tak should be three-sided? In the movie, Ra's pyramid ship was 4-sided, and this made sense, as the 4-sided stone pyramids of Earth were intended as landing sites for ships like Ra's (though it suddenly occurs to me that if your ship needs a giant mountain of stone before it can land, probably "ur doin' it wrong". The show even depicts 3-sided craft landing on 4-sided pyramids, always from an angle that glosses over how the hell a 3-sided ship fits over a 4-sided base Always seemed odd to me. Was the 4th side that much more expensive? XD