The icons are in the /UI/UI.package and the description is in /Text/Build.package.
I assume you found and enabled it in Bonvoyage's roofs.txt, plop the attached file into your download folder and change the last entry to;

# EP6 Pagoda octagonal
roof 32
defaultRoofPattern "roof-ui-hipped"
thumbnailResource 0x499db772 0xacdc1006
roofSlope .5
catalogTextIndex 35

I assume Maxis disabled it because it's a difficult roof to work with, I have to place a couple of temporary walls as outer corners for a place to begin and end the roof at.