I need some help with fakeblocks.lua and RGB Pipes

[PizzaNoob]

Basically, I want to draw the mask of the pipes when I create a fake wall with them. I tried specifying the blocks with a ¨for¨ and ¨do¨ statement, specifiying the blocks that use the pipe masks, but it didn't work at all.

Here's what I'm dealing with for reference.