I meant to post these as I worked but it didn't happen for one reason or another so here's the rest of the triangle project
All 4 sides in a strip just before they became.....
The first 2 tetra's joined
4 tetra's joined, makes an interesting shape
6 joined in a strip and when you joined them together you get ......
a Kaleidocycle or as it's also known a hexaflexagon (I hope the video works!)
One of these was posted on a Facebook group and that was it I had to figure it out, far too impatient to wait for the instructions :)