I built a frame out of 2x2's and covered it with 1/4" luan (ply or osb)
I nailed all the luan on execpt for the top.
That was screwed on with 1" drywall screws.
Set your model inside and make a 1/2 moon cutout from a piece of luan and put pipe wrap on the edge to prevent scratching. Screw that wood to one of the formers in the crate.
Make another 1/2 moon plywood,, put on the pipe wrap and screw it on from the top down putting gentile pressure on the fuse. This will prevent the fuse from sliding around.
The wings I wrapped in bubble wrap and put them in the sides of the crate.
Between newspaper and foam peanuts I filled the entire crate. Took them to Greyhound and never had a issue.
VERY IMPORTANT......... right on the top of the crate,,"DO NOT STACK" That way the shipper won't put stuff on top.

Good luck,,, It's easy to do. Materal will be around $25-$30 and about 1 1/2 hours of time

Hoss