That's Air Hollywood's B-747 set.[1] They have other aircraft sets, an air terminal set, and supporting props, such as uniforms, beverage carts, and such.

[1] https://airhollywood.com/aviation-sets/wide-body-747/

Those kind of sites often "rent" out things owned by others - if you're near LA and build a full-scale replica of something, there's a studio company willing to rent it.

Is there a word that combines wholesome and insane?

You might enjoy https://www.lucaiaconistewart.com/model-777.

Wow.

Parents, take note on how childhood experiences influence people for the rest of their lives...