Jan Dodonna: The Sith Battle Cruisers transported Nihilus people to somewhere in the Unknown Regions at the time of Naga Sadow. After old Sith Empire collapsed with the war with Republic and Tetan Forces. They found interesting solar system where things are different, that I will make a layout of the solar system when I have internet connection on my computer. There is a rule about Nihilus cannot rule his people until he is strong leader and powerful practitioner of the dark side of the Force because he was from a royal family and he is the prince. The old ships and fighters of the old Sith Empire are relics and they will have to be scrapped once he is in power to make room for the new Sith Battle Cruisers.
Massassi serve as troops and crews on the ships that they will be filling the spaces on the ships. Nihilus is going to make changes to replace the old ways on building Battle Cruisers and other ships with Shipyards. Normally, they were built on the planet(s). Money?? Does TRF have money to build ships? They still have the plans to build it and other ships and fighters.
Sith Slayer with its advanced droid brain will be so expensive that they are quite limited. Nihilus and his people has the know how to make them but materials are very rare to produce until the droids are placed into the alchemy machine to alter it and even to alter a person's appearance or a creature's appearance. To able to use the Alchemy machine, he will have to learn to make alternation perfect or be a fail experiment. It's no easy task.
We don't actually have a financial system worked out, but ICly it would cost you money and resources to build a ship, and for a single character, the amount of money/resources needed to build a warship of that size would be outstanding.
I think a Sith battlecruiser at the time of Naga Sadow is in comparison to size of an Imperial Strike class cruiser. But because of ancient technology, weaker firepower, and simpler construction, I believe it would cost about the same to maintain, despite it being hard to find parts to help maintain it. I would think, for the ship, about 10 million credits a year would be sufficent, 25 million if in constant combat. For the crew, 20,000 credits for the standard crew man per a year, so I think a likely crew would be 15,000 for a ship that old. So that's a total of 300,000,000 credits a year. Basically you would need the tax income of say, an average farming planet, to maintain your battlecruiser at full capacity.