Clauses, embedding, SFPCA and Taxis - Experts please

This question is for experts:

How would you break the following clause complex(?) into clauses and represent the relationship between them?

I know it the sentence isn't perfect, but I'd still like to analyse it the way that it was spoken:

This leads to my next reason why I want to bake a cake is that it's therapeutic.

Do you think it is:

This leads to my next reason why I want to bake a cake || is that it's therapeutic.

This (S)

leads (F/P)

to my next reason (C)

why I want to bake a cake (Adj-circ-cause:reason) ||

is (F)

that it is therapeutic (C)

OR

This leads to my next reason why I want to bake a cake || is that it's therapeutic.

This leads to my next reason (Adj-modal:comment)

why (

I (S)

want (F)

to bake (P)

a cake (C) ||

is (F)

that it is therapeutic (C)

OR

This leads to my next reason why I want to bake a cake is that it's therapeutic.

This leads to (Adj-conjunctive)

my next reason why I want to bake a cake (Adj-modal:comment)

is (F)

that it is therapeutic (C)

Or should it be broken down in a different way? (3 clauses, 4 clauses?)

How would I show the tactic relationship between clauses assuming there is more than 1?

Thanks.