After a lot of troubles I was able to go ahead with the projects.
I will post new updates during the week. Now the source has an MDF inside the app_folder and I changed the connectionStrings to reflect it.
Unfortunately I have to detach the DB in SQL Express each time I want to run the application, and in the same way I need SQL SSMS to design the db and the links.
THe original design is different from what we decided, so I am going to merge these changes to reflect also the member section.