I received a Wildgame Innovations camera for X-mas, but was having trouble finding a lock box for it. Being a frugal guy I decided to explore making my own.
I found a steel electrical fuse/switch box at Lowes for $15. The box is way bigger then what I need, but for the price it works for me.

Of course the box has stuff on the inside.

Remove three screws and the fuse block is gone.

I laid out my opening for the camera and cut it using a Dremel with a cut off wheel.

My finished product with my first and feeble attempt at painting camo.

Side View

I used some dense foam to account for the extra space around the camera. When the door is shut there is a little pressure needed to compress the foam and hold the camera in place.
The holes in the door for the python lock are lined up with the existing mounting holes in the box. Depending on the tree diameter and the cable length one or both set of holes can be used.
I know it's not the prettiest thing, but it's functional and just as secure as some of the lock boxes on the market.