i've tried to compile your code so to know and and understand the engine_vars but
i've got an error that i don't understand

1>project.obj : error LNK2001: unresolved external symbol "struct ENGINE_VARS * ev" (?ev@@3PAUENGINE_VARS@@A)
1>C:\work\project\Debug\project.exe : fatal error LNK1120: 1 unresolved externals

i've linked the sdk_engine correctly and the 3 tutorials worked fine

can you tell me what could have gone wrong?