I was thinking the same thing! I wasn't happy with the initial results and have put the project on hold. I can give you some advice.
Here is where I stopped. I wasn't happy with the quality of the covering job, and the aluminum I was using for the corner protectors (and as a device to hide the seams) was expensive and tedious to drill and countersink. I am going to shelve it for a while.
I used some of my learnings to build another kind of box which came out better. It's a box to hold Tommy gun magazines.
What might help you in your attempt: use contact cement as the glue for the cover - I used some 3M 777 spray adhesive which is total crap. Also, cutting out the material in a kind of cross pattern with enough to wrap the corner edges and fold over into the box is key - you can see some of this technique in the magazine case photo. It comes out pretty clean. Also, stretching the vinyl a bit and using a j roller to really press the glued surfaces together helps.
There is a great site with lots of latches, etc.,
http://www.brettunsvillage.com/I'd say practice covering a smaller box first and learn the technique then move to the motor case...or just buy one. Once you buy wood, hinges, clasps, leather straps, felt, vinyl, a handle, corner protectors and metal feet, plus a tool or bit you'll likely need here and there, you will be into the project about $150.
