Consider the different locations of the subject, adjective, and conjunction in the following sentences.
A boy as trim as Bob should be a fast runner.
As trim a boy as Bob should be a fast runner.
The second sentence sounds unusual to me, but I am not a native speaker. Is it ungrammatical or merely a literary form of the first? If the second version is grammatical, does it change the emphasis (e.g. from the adjective to the subject)?