Magnum weight and balance

[Ivan_Allen 3]

Doing a preliminary weight and balance to determine battery location on my Magnum project. I want to be sure the manual is correct when it says to set wing level at the fourth rib tail.  I was quite surprised to find the door sill out of level by an inch and a half in it's length. Put another way the tail is about 9 inches higher than I expected, and the aircraft appears quite nose low. Nothing wrong with that as long as it's.correct.  . I had always assumed the door sill and the  center fuselage longeron would be close to level but that's not the case at all. Thanks in advance.

[1avidflyer 1983]

Can't say for the Magnum, but as I recall on the Avid MK IV and earlier ones, you level the one closest to the lift strut attachment, and that is the third rib tail out from the fuselage.  JImChuk