This is one of the kits in the Airfix Engineer line and is designed to teach, so it’s not really a model of a real combustion engine. Rather, it is a representation, and as such is much simplified. That being said, the kit consists of 92 parts, excluding screws. No glue is required for assembly with everything either being pressure fitted or screwed into place. In addition, no painting is necessary. As a matter of fact, it may not even be possible as all parts that are pressure fitted are of a soft, almost vinyl plastic and getting paint to stay put on them could be problematic. But again, this is a representation, not a model of a real engine and the parts are modeled in several colors to make them stand out.
The kit is motorized and has many moving parts and there is even sound and light. The instructions are in a 22-page booklet, but only ten pages of it are actual assembly instructions. The other pages are dedicated to a parts list and eight pages of information about how an internal combustion engine works.