Stay as far away from USP and FEDEX as you can get. They are expensive and they've broken all the planes that I shipped(3 total).

For a crate, you can build one with 1X2 wood and 1/8" plywood. Build a box with the 1X2 as a frame and then screw the plywood to it. Use liquid nails construction adhesive for added durability. Apply the liquid nails to everything that will be screwed together---framing, plywood, styrofoam.

After you have the crate built, lay the plane inside and hold it in place with 2" styrofoam board.

There is an article on the buying forums that shows how to build a nice crate for a reasonable price. You need:
1/8" plywood
1X2X8' wood
liquid nails
deck screws
styrofoam board 2" thick

It takes a few hours to buid the crate, but when done right, it will survive Greyhound or Forward Aire.

Nothing short of an armour plated box will survive UPS.