Models of interior are desighed to a clear demonstration  of design and compositions of  indoor premises. These models usually make  at scales  1:50, 1:25, 1:10.
In the interior models usually will not be shown  exterior of rooms with an emphasis on  inner layout.  Interior model will be made with  transparent  inner walls (internal bulkheads) and removable top, or without roof (without  (without upper bulkhead). One or two outer walls are often transarent or they are absent.  
Depending on which task lies ahead of modeller, maturity of interior details can be simple, medium or high.