Help with Walthers modulars template.

[Biased turkey]

I downloaded and printed the Walthers ( N scale ) modulars templates and instructions. It seems quite easy to assemble that kind of structures.
One thing that puzzles me is the height of the Large wall with the the railcar doorway ( 933-3282 part #20 ). That piece has a height of 40 mm while the height of a standard wall is about 29mm. So it's too high for a 1 story building and too small for a 2 stories building ( 58mm ).
Could someone please explain how to make that specific wall fit in a modular building ?

See the enclosed picture.

 

[eightyeightfan1]

Looking at the picture:{Walthers Model Railroad Mall -- product information page for 933-3287}, Seems like using the "large wall" foundation, brings the first floor window wall up to the top of your rail door.

 

[nkp174]

I presume that the opening is properly sized, but I'd run my NMRA standards gauge through it just to see if it couldn't be cut down...although I'm sure it is right on and their is a logical way to get it to work! It just isn't clear from the directions. My Precision Scale brass trucks were like that...no instructions and not even a picture to help figure them out....just took a little time.

Sorry I can't offer more specific advice.