Modern Master Detail Pattern

I am going to create new Financial web application using Asp.net MVC fully ajax, hosted on customer intranet. i have Company setup screen, Company Model is shown Below.

Company  {Main Company info, Bank info} 
.|_Regions - each :{Region info, Contacts}    
...|_Districts - each : {district info,Contacts}    
.....|_Branches - each : {branch info, contacts}

I thought to make it master/detail , master/detail, master/detail in one page, another idea to make master/detail for company then tabs for region,district and branch and make each tab dependent on previous one. i don't like both ideas, it is开发者_JAVA技巧 very difficult for user to understand the page layout, in addition it is very old style.

the problem is all application pages follow this pattern. I need smart idea for page layout fit with nested model like this example , i prefer if it is inspired by IPad or mobile apps designs.

thanks