Outer Limits 4x4 Board

Hey all, new to this site. Just want to know if any one has got some ideas on where to put the aux battery. Batt. trays I have enquired about to fit under the bonnet are only 8 inch trays. I would prefer to have it sit under the bonnet. Has anyone out there done any mods to fit a larger tray etc. If so could you let me know what you've done. Thanks. By the way my Navara is a 3.0 turbo diesel.

post a pic of the yray or motor well as im sure they can be folded down for 9 inch batteries.
mine is a d22 but similair .
no real dramas relocating air box prefilter and fuel filter.