I've created them so they can be extended, the "run" can be doubled or trebled without bending making it about 3 metres long. You could attach a small length of pipe to another unit with multiple outlets meaning you can go sideways or up and stack them! I've designed this one from research and issues I've had! Whenever I ventilate a fungus garden it doesn't do so well, from the hundreds of videos and pictures I've seen the fungus gardens aren't directly ventilated, that said the lid isn't air tight but is ant tight!

the outworld is so much easier to get my chubby hands in and out with new and old material, it would make sense to have multiple out worlds and alternate their feeding to avoid them laying in wait like the Attas do!
Thanks for the comments btw! I'll be monitoring their progress carefully!