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I have a model contain 3 variables X, Y, and Z.

Variable X is a second-order construct contain from 3 formative variables X1, X2, and X3 (Type 4: formative-formative).

Variable Y is a reflective construct and mediates the relationship between variables X and Z.

Variable Z is a second-order construct contain from 2 reflective variables (Type 2: reflective-formative).
H1: X has a positive effect on Z
H1a: X1 has a positive effect on Z
H1b: X2 has a positive effect on Z
H1c: X3 has a positive effect on Z
H2: X has a positive effect on Y
H2a: X1 has a positive effect on Y
H2b: X2 has a positive effect on Y
H2c: X3 has a positive effect on Y
H3: Y has a positive effect on Z
H4: Y mediates the relationship between X and Z

1) Can a formative second-order construct be established?
2) Can we employ the 2nd stage to analyze the HOC model? how can we test the sub-hypotheses in the model?
Could you please guide me on how to conduct the analysis of this model and how to report the measurement and structural model?