It's right! Maybe it's not right to you depending on the height of your slant. Take dimension of first triangle (the opposite piece is similar to dimensioned piece) glue them, then measure the actual dimensions of remained triangular gape of the slant. Thanks!
I was trying to create this model and found out that the measurements are incorrect coz the gate 18cm is too big and the model can’t be based on inaccurate measurements.
