This is a mod to Bilbostompers octagonal towers. When assembled it converts the wide openings to narrow openings. I keep my tolerances quite tight, so this fits snugly into place. This allows you to use the narrow walkways and stairs on the wide opening sides of the tower platforms.
I've colored the linework so you can also print this as a full railing.
Tower_Platform_Opening_Converter.svg | 22.1KB |