Righto. Packed a Tool Kit and it hasn't taken up as much space as I was thinking.
So Tools I chose:
I purchased the little plastic toolbox from Bunnings for a huge expense!. ($4.98). it's only 330mm long but fits pretty much all the gear.
Box Packed:
altogether it doesn't take up a lot of space. But I'll install some U bolts into the floor of the boot to hold the kit down while driving so it's not flopping around for the duration of the trip.
I'm feeling confident about the kit. I may add some more cable ties though. in case I hit a skippy.
Cheers.