Can the author modify the model based on my needs?

Buying: Finding models

The marketplace rules do not put any obligations on the author with regards to modifying any of his models . However, the designer community on CGTrader is really friendly and customer-oriented, so if you have specific needs, just contact a seller and he may help you on the request. You can do that by using Questions? Ask for product support button on item page or by visiting the author’s profile and sending him a personal message.