briapf

Hi - I am new to the forum - I have been working on building the factory in the idea book 226 p.37. I am struggling to figure out a few items: 1. what is between the two structures - I see some gray - can't tell if there's a door. 2. what doors are used on the upper part of the structure - are they 1x3x4 (left and right) 3. on the bottom between the two arches on the far side - is it 1x3 that separate the two? any help would be greatly appreciated. many thanks -