From there I can go on to assembling the two halves of the box. Using 1.75" wire brads, I tacked all the pieces together.
Test fit the top...
Next I'll cover the plywood with thick, black contact paper, and put angle aluminum stock from Lowe's or Home Depot along the edges. This will reinforce and protect the joints from any damage that could occur in handling. On the inside of the top I'll install some 1" thick foam to pad the top of the pedals and keep them from coming loose when the lid is on.
For hardware I ordered the handle, latches, corner pieces and rubber feet from Reliable Hardware. Shipping was a bit steep for the few things I ordered, but they're still the cheapest place that I've found. And all their hardware is made in the USA, so that's a plus.