Dont forget to lower the first layer speed. Fans 100 % during overhangs.
Supports are only needed for the tongue, so that it stays on the bed for the initial layers.
If you put supports inside the joints the print will lose its ability to turn.
Becarful when you lift it from the bed, it is easy to break (the tongue). If it brakes here is a useful video : https://www.youtube.com/watch?v=1UUpCggeq1c