Toolbox for TVR Vixen diff cover

[Sonus]

I am thinking of making a toolbox to fit where the diff access cover is in my Vixen. There is some height available to make a shallow box with foam inlay and lid for necessary tools to bring on longer trips. I won't be able to fit the largest tools, but spanners, ratchets, screwdrivers etc should fit.

The box would be made from FG and foam cut to make the tools fit snug.

Question is what are the essential tools to bring?

1/2" spanners x2
Philips screwdriver
Flat screwdriver
1/2" ratchet and sockets maybe?
Spare fuses
Spare bulbs

What else would fit within the width, depth and length confines of the diff cover?

Fitting would be via clip nuts

[Sonus]

Neat idea Andrew, but My battery is going there