Design is Not Structurally Sound, But No Red Tiles

[Llewen]

Just that, I'm trying to build a little workshop, and I've completed the design, but when I try to commit it, it tells me it isn't structurally sound. But there are no red tiles anywhere in the structure.

Screenshots:

 

[Kri]

Reminds me of the stilt houses down by the coast here in Texas built to withstand flooding.

 

[JC the Builder]

Try looking at it in the 2D Classic client. Maybe it isn't showing up properly in the Enhanced Client.

 

[Llewen]

I found the problems. There were some floating floor tiles under the roof, and the pillars I used apparrently don't work for holding up floors. Beyond that when I finally committed it, it was really ugly and I've scrapped the whole thing and started over again.

edit: Correction, scrapped the whole thing, had some ice cream, and started over again...