G&G genius ideas squad needed

IF you were thinking of staggering them in height, I'd put one on top of the other alongside the tunnel with a path between........
Like this............PT,/2 pipes/path/2 pipes/PT.
Not sure that would work with the cradles though??

I’ve just had a Play with this . PT /2 pipes /path /1 pipe /PT.
That works.
not quite enough space for 2 pipes either side. 

I could cut the other half pipe into 1m lengths and probably do a teared stand.