Behind the barn...

I loved the video and feel ever so slightly envious but I haven't the foggiest about your polytunnels. Sorry!
What are the options:- Side by side, end to end, V shaped, L-shaped, T-shaped?

They're normal tunnels just straight lines. My options are either to put one at the end of the other in one straight line to make a 3x12 tunnel... or directly side by side so the two doors are next to each other..... or side by side but one a bit in front of the other... I think we're leaning towards simply putting them side by side, with the gable-ends in line with each other, for simplicity of building the base.

I'm in such a hurry to get them up that I can't even begin to think how we could make them into a cross or T shaped... although if we consider another location, an L shape would be an interesting experiment!

And thank you