It's been a while since I've actually built (excluding the ML MOC). It felt great to build another mini scale ship.
Anyway, now for the fictional stuff.
The Testudo Star Destroyer was introduced towards the end of the Clone Wars and was used by the Republic as carriers. Their extremely thick hull provided the troops inside protection from the volleys of Seperatist lasers. Because of this the Republic useually psotioned them at the front of their fleets so they would take most of the CIS fire and still survive.
About this creation
Like the Venator the Testudo has two bridges. One for flight control and the other as a sort of stratagy centre.
The Testudo has no windows instead holograms show the occupants what is happening outside.