Principally Absima, Team Associated and sometimes Kyosho, offer kits of their radio control cars for assembly. These are all good quality cars and relatively high specification for the price - higher than equivalent Tamiya ones for example.
Absima use a purely "build by diagram" method - part numbers in the manual are only there for you to buy spares, the build is done entirely by diagram.
Minichamps 437 081307 Ast...
Revell 24619 COOBRA Rally...