Help me for my testwork😭

Whats up, I’m wondering if it's attainable to place the drainage on ventilated flat roof like that method. I noticed how my classmates did however none of them have been related form of mine so I'm unsure if it's right. It's not completed but and I’ve extra stuffs so as to add however I wanna be certain it's going right method. Pls give some recommendation on it thank uuu 🫶