@David, Moderator posted:
The sentences do make sense to me, but only when my mind supplies the comma that is absolutely essential and sorely missing before "so."
Ahmad is using "so much for" in its idiomatic, exclamatory sense (see here). Normally, "so much for" sentences are not introduced by a subordinate clause.
I'd prefer the sentences if each were divided into two separate sentences or into two independent clauses conjoined by a comma and then "so."
5. The equipment never (even) arrived. So much for using it properly!
6. The equipment never (even) arrived; so, so much for using it properly.
Ahmad, I assume you are already aware that idiomatic "so much for" clauses are only appropriate in informal, conversational English.
I know that usage, David, but the punctuation was faulty. As written, they made no sense.