That is correct. Though features are also separated out into mojoPortal.Features.UI and WebStore.UI so when I speak of the Web.UI I mean if you are implementing your own projects you will follow the same pattern and have a Web Application project for your project's UI, probably named like yourproject.Web.UI or yourproject.UI. So I'm speaking in general terms that projects are structured in the 3 projects a Web UI project a business logic class library and a data access class library typically with conventional names like:
yourfeature.Web.UI
yourFeature.Business
yourFeature.Data
Hope it helps,
Joe