In the past, I've generally set up one project as my data layer for not only NHibernate based projects, but other ORMs as well. This is fine for projects that have a moderate amount of domain models, but what if your data layer continues to grow? This post will help describe how to manage your data layer across different projects.
Nancy has a lightweight, low ceremony view engine built right in called the Super Simple View Engine. It has basic functionality that allows you to get the job done for simple sites, but what if you want to do a little more than the view engine offers? This is a good read if you want to know how to extend the SSVE.