These were among the first models I bought from Forgeworld many years ago. These and the support vessels are made form a grey resin in multiple pieces.
I painted these with a black undercoat and then painted them (not dry brushed) with Privateer Press’ paint similar to Space Wolf Grey. I painted the gold filigree on the sides of the vessels with Reaper Antique Gold and then put a black wash over the gold areas. I then trimmed up the wash on the areas where it seeped unevenly into grey.
I have started using some of the connectors I bought Ninja Magic. These have a top that attaches to the vessel which contains a circular magnet a serrated connection to a bottom cylinder that also has a magnet. The genius of these connectors is that you can remove the vessel from the base so they will store and transport more easily. You can see the bottom section of the connector in the pictures beneath the vessels.
Great models, relatively straightforward painting job. If you are into BFG then you should check out the rules for the Grey Knights on the Games-Workshop website (PDFs).