Space 1999 eagle is one of the best models ever.
Most shows had people doing things last minute. Films too.
Phill Tippit filmed a Starship troopers 2 (an under rated film) scene at home.
98s Godzilla had a suicide man on top of many biuldings. R2 as well if I remember correctly.
The cardassian ship in tng had the builders initials in the details.
There was a tank model part that was used in lots of ilm models and even got made full size in the matrix.
The flying Hunter killer engins in terminator start as flat card/wood while the real deal was being finished.
Many films use model kits like Id4 did for jets. Once models for shows are made, these often get used in later years.
Dr who used toy Daleks.
Lord of the Rings. Paper doilies for elven architecture. Tea for leaves, weeds for trees.
There is an endless list. Too Little is covered regarding model effects, I feel.
Also when a model is said to have been made from an item, usually, some work has gone into adding to and detailing and painting it. Things like suicide man and r2/Vader what not are usually gags to be seen if lucky.