Finally update 3/3
The fire extinguishers and my tow strap then I think I've covered everything for now 
First the simple tow strap

How its bolted

Next up the fire extinguisher plumbing
The piping bends like pipe cleaners so its fairly easy to mold. Just need to get some p-clips and secure it properly

Needed a nozzle bracket so I made one out of aluminium

Attached it the firewall


Then plumbed it up 

So that was my day... so far... I'm not done yet. Update 4 to come later on 