Just did one for my Dakota, but it's pretty universal so I figure someone might benefit from this thread.
5.56 ammo can - $16 at local military surplus store
4x white LEDs - $10 at Advance Auto
1x toggle switch - $5 at Lowe's
6x 1" #8 self tapping screws - $1 at Lowe's
1x mailbox lock - $5 at Lowe's
other supplies I had lying around:
Flat black spray paint
grinder (if you want to remove the handle on top and the front so that they don't rattle)
The lock, LEDs and toggle switch are all that will be going on it for now. Sometime in the future, possibly next weekend I'll be adding a second toggle switch and exterior LED's on either side as long as strips under the dash for footwell lighting when needed.
5.56 Ammo Can
hole layout for toggle switch on drivers side
LEDs, toggle switch, and lock
hole layout in rear for LEDs
test fit for LEDs
holes layed out and drilled for where I'm mounting it