Sentence Analysis-complex sentence

The email is from Nicole saying they are having trouble with the sign ‘Envelopes and Packaging’ because this only just fits the wording on the 918mm-wide version Wall Bay while the sign width we are using is 722mm wide.

Nicole suggested changing ‘and’ to ‘&’, but even if this is an option, we still don’t know if we will have enough room.

Do you see these sentences as grammatical?

Would you say I'm on the right track with my sentence break down below?

The email is from Nicole =main clause

The email=noun phrase;subject

The=definite article;determiner

email=noun;subject

is=linking verb;verb

from Nicole=prepositional phrase;adjective phrase

from=preposition

Nicole=noun;object of preposition

saying they are having trouble with the sign ‘Envelopes and Packaging’ =participle phrase;adjective modifying email

they are having trouble with the sign 'Envelopes and Packaging'=noun clause;object of saying

they=subject;noun

are having=verb;present progressive/continuous

trouble=noun;object of verb

with the sign 'Envelopes and Packaging'=prepositional phrase;complement of trouble

the sign 'Envelopes and Packaging'=noun;object of preposition

the sign=noun phrase;object

the=definite article;determiner

sign=noun;object

'Envelopes and Packaging'=noun phrase;appositive (the sign)