Hope this is helpful/inspirational.
It certainly is inspirational - a beautiful piece of work. (Must be nice to have so many locos that you need to stack them
It is clear that carrying a loco to a meet is very different from shipping. The latter requires that you set up the locomotive in a fairly rigid frame inside a foam or similar enclosure, so the loco can decelerate as slowly as possible when it is dropped. It's the sudden stop when it hits the floor with no padding that causes breakages. Accucraft uses 1"+ foam on all sides of the packaged locomotive.
Not having a table saw or any workshop in my Florida condo, I made carrying 'boxes' out of a variety of scrap material so I can move my largest loco around. You can see the construction in this photo - the opposite of Dwight's lovely woodwork. The heaviest uses a pair of threaded rods inside tubes to support the top crosspieces and the handle, which is an old piece of closet rod, with a hose clamp to stop it moving. The crosspieces are poplar or similar hardwood.
The most important part is difficult to see. The sides are pairs of regular furring strips with one at the bottom screwed firmly in place and the upper one on a piano hinge with 1" foam on the inside to hold the object firmly in place. [I didn't measure it so the foam is compressed 1/8" - but its compressed.] There are a pair of cotter pins (you can just see the fishing line that stops them getting lost,) that are pushed into place to hold the sides in place. A coupler at the end is also used to keep the tender in the right spot. The design came from Chuck Inlow, one of the guys on LSC, where there was a discussion a few years ago.
The bottom is grooved plywood (that came with the loco,) and the far end has a drop-down ramp on hinges. The underside has 4 nylon feet that allow the base to clear the track when set down over it. Drop the ramp and roll the loco directly on to the track.
The lack of beauty isn't a problem, as the (attractive) locomotive is displayed on my shelf and the (ugly) carrying frame goes back in storage!