I'm attempting to boolean subtract some holes into an open block (which was also created with a boolean subtraction). The first subtraction works perfectly. The second causes errors. (see screenshots) I thought I could knock this out pretty quick, but the conventional quirks are causing issues. The other blocks that are visible were intended to create additional boolean subtractions, But this plan obviously isn't working. Booth subtractions were created using the blocks at screen right.
Here's another example of failed basic booleans. I thought this might work better with single blocks to make up walls, ceiling, floor or scene. The first 2 boolean cuts work, but the third cut fails. I'm assuming this is due to the structure of Polygonal models, etc, but I was hoping to quickly model this scene with a few basic blocks with boolean cut openings.