You won't find a more realistic nitrous oxide bottle than this one.  Use one for a fire bottle if you have a fire suppression system plumbed.

(The parts photo shows resin bottles and valve, but the bottle is aluminum, and the valve is 3D-printed)

This 10 lb bottle is made for a lay-down position such as in a trunk or the cockpit floor.

Includes:

• CNC aluminum bottle (.028" diameter)
• 3D printed valve handle 
• Photo etched bracket

Add a NOS decal found here.  The 'large' size is a great fit.

The bracket ends fold down to provide an angular mounting configuration and the bottle holder ends folds up.  Be sure to fit the bottle to the bottle holder before doing any final finishing of the bottle!  Flash from the etching process will probably need to be removed with an X-acto knife to allow the bottle to slide into the mount.  It is a fairly close tolerance fit! 

Assembly required.

Aluminum, 3D-printed and photo etched parts by Futurattraction, 1/25 scale