You're not being too picky. Latin is a picky kind of language.
In Latin, adjectives must agree with the nouns they modify in case,
number and gender.
The Latin word for book is liber
. In this instance, case is nominative,
number is singular and gender is masculine. The nominative, singular,
masculine of novus
The usual word order is noun, adjective, but word order is not as
important in Latin as it is in English. It is not uncommon to use word
order for emphasis, as you intend.
So . . .