I wire-peg mirrors and other small items when I attach 'em to my models. Much more resistant to falling off, then. I've not gone to this length yet, but a person could construct some kind of protective 'box-shape surrounding' thing out of corrugated cardboard that could have post-it note material glued to the underside perimeter of such structures, so that they could be safely temporarily stuck to the model. But what has worked for me is miles of toilet tissue wrapped around the model like what Wayne Swayze suggests, within a box surrounded by packing material that is inside of another box. One more thing, make sure the inner box at least is crush-resistant. One can do that even with a regular model kit box, just take a large corrugated cardboard sheet and cut two layers of rectangles matching the insides of the kit box -- the key is is that one layer has the corrugations going in one direction, and the second layer is going 90° to the first layer. Cut a cardboard paper towel dowel down to the inner height of the box, and you now have an additional piece preventing the top from caving in. You probably can't park a car on such a reinforced box, but it might stand a far better chance of surviving whatever football practice it gets used for at the delivery facility.
Usually I can find photos of what I'm thinking in Google image searches, but it seems to let me down this time, so I just made my own - take Rob Shmit's mild custom seen in the Favorite Caddy thread and lose a good chunk of the middle. But in order to make it look right, instead of moving the rear wheels forward along with the body, they'd look more factory-ish if they ended up centered within the 'moved-forward' section.
Achieving the allusive 'show quality model' level is basically building something that - if magically expanded to 1:1 size - could be mistaken for being a fully functional vehicle. So, imagine using so-so quality black thread for plug wires, and blowing those up to 1:1 size. An ordinary person might then say, "Man, the insulation on those wires sure is hairy." Or for an outside door lock, "Wow, this thing isn't even round, it doesn't look shiny like stainless steel, and there is no slot to put a key in." That's the level of detail a person can get carried away with. Btw, the door locks on my avatar's 911 woody wagon are bits of aluminum paper clip wire, chucked into my motor tool and polished flat and into perfect circles, with a vertical slot scribed into them with an xacto blade. Beats a dot of silver paint, and it wasn't especially hard to do. Plus, as a wire where you just see the ends, they also serve as pegs to hold the handles much better to the sides of the car.
One more, sorta, but for me it's just the first 1 minute 40 seconds of Sylvester Stallone's "Over the Top", since the road he's on (in the not super bright sunshine scenes) is from bits of my favorite Colorado summer vacation road north of Durango to Ouray. Entertaining Autocar he has.
Alas, as underfunded as the IMCM is, which results in the website running behind on updates, don't let that appearance dissuade you from visiting. Speaking from my multiple visits during the GSL contests, and from news of major new recent model acquisitions, let me suggest that you make a particular effort to visit it. Tours will be happening during next year's GSL, with presentations of that new material happening at that time, and it is available for private tours, but through reasonable advance inquiry.
My vote goes to the 2nd photo with the spinners. Glad to help with the visualization of the side window openings. One of my weaknesses is for customized Vettes, so I couldn't resist seeing how the suggestions would work on the window openings. I've photo alteration-visualized a few of my own Vette ideas, including this one within my 'artwork' thread of a custom I won't probably pursue. Handy to have my graphic arts training and my obsolete CorelDRAW 11 program to use for 'virtual model customizing'. By way of example, I thought I had a fun idea of combining a Daytona Superbird with a '72 Mustang a while back, but I absolutely could not get the illustration to look good. So, I saved myself the cash from buying a Dodge for a custom that would have looked just as bad in real life.