Hi, I recently sent in templates but I didn't account for side flaps which I most likely would need. Does that make the templates I mailed useless?

Hi Scott,
Getting the template right is very important.
I suggest making a new template with the flaps. You want your unit to look good so it's well worth the extra effort to get the template right. Once you've got it right then all future orders will be a breeze and you'll be a happy camper.
Regards,
John