Nice
I like that, looks useful.
If you cut the fronds and gather them keeping the cut ends downwards like a bunch of flowers, and lay these bunches in overlapping scales they make a really comfortable nest and it's not only beautifully scented it helps keep bugs away, and they aren't prickly like many pines either.
The leylandii is best laid overlapping so that any sap doesn't end up on your bivvy but it also works if you cut the branches fairly small and stuff one of the survival bags and it'll make a good mattress too. No scent this way though and it's not as warm for some reason.
There's always some dry small stuff for fires around a leylandii too
cheers,
Toddy