For more details you can download for free my LDD (Lego Digital Designer) Building Instructions and Parts Lists: TiGa ST04 Venator modofications LDD and Parts Lists (ZIP)

Mace Windu's commander ship: the Dark Red Bridge of Endurance from Clone Wars
Similar commander ships: Aayla Secura's Liberty, Obi-Wan Kenobi's Negotiator, Anakin Skywalker's Resolute

Mace Windu's commander ship: the side hangar door and windows of Endurance from Clone Wars
Below: some additional ideas for ST04 Venator Star Destroyer ship modification:

One more additional idea for ST04 Venator Star Destroyer ship modification (comes from Iomedes Venator):