Regarding the Mursten-era door (u8012) and windows (u8019–u8024):
The geometry of these parts is not quite right, and leads to collisions when the tabs are interlocked as intended. I propose this modification, which avoids these collisions, and also those that arise by placing the tab behind a neighboring brick (as seen here). But the real geometry may be a slightly thicker tab that fills the slot better, with the part itself being slightly less than a brick-width in Z (so maybe 18 LDU or so), relying on the part's flexibility to fit behind or in front of a neighboring brick.
This revision also subfiles the tab, for brevity's sake. I use u8021 as an example, but all seven parts would be affected.
The geometry of these parts is not quite right, and leads to collisions when the tabs are interlocked as intended. I propose this modification, which avoids these collisions, and also those that arise by placing the tab behind a neighboring brick (as seen here). But the real geometry may be a slightly thicker tab that fills the slot better, with the part itself being slightly less than a brick-width in Z (so maybe 18 LDU or so), relying on the part's flexibility to fit behind or in front of a neighboring brick.
This revision also subfiles the tab, for brevity's sake. I use u8021 as an example, but all seven parts would be affected.