As I upgraded to a Tatara frame for my Anet A8, I don't do any upgrades for the diagonal reinforcement anymore. If your frame is 6mm thick, the top parts should fit easily. By the look of it on your picture it is. Furthermore, I noticed that the lead screw is sticking out, which may indicate that it is not far enough inside the coupling with the motor. If it is in far enough, just use Tinkercad to make a hole in the top part to fit your lead screw. If your frame is more than 6mm thick, you can easily change the space you need in Tinkercad as well.