Officially Battlefleet Gothic is no longer being supported by Games Workshop. However, there really hasn't been a better time to get into the game. It has started picking up and is being played at conventions more than ever it seems like.
The original ships, being all out of print are going for stupid prices, but there are several third party makers selling physical sculpts that really fit into the theme and make good proxy ships. Also, there is an abundance of 3D sculpts for almost everything for the game, with a wide range of designs.
There is a updated fan play tested rule set that has been getting regular version releases and tweaks. Also, a 30K version of the rules is out as well. Many ship classes that were never officially in the original game but appeared in the fiction have been given rules and play tested into the game now.
As for the ships themselves, one of the nice things is that the in universe fiction is such that two of the exact same class ship can look very different depending on what world they were produced from so you can do a lot of mix and match with different makers to have some variety to your fleet. With 3D printing, it's pretty easy to make custom bits and such to do even more with your ships. Such as putting a custom bridge or prow onto a ship, changing the weapon load out, or add faction themed bits.
I've been thinking of getting rid of my original ships and just going full 3D printed. Most of the ones I am using now are from
Hello! Soul Forge Studio is a collaboration between johnthewarlock and Danny_Cyanide. We are both very creative and want to expand our modeling skills while making highly detailed models for tabletop wargaming. - Soul Forge Studio @SoulForgeStudio
www.myminifactory.com
Vanguard miniatures has some nice physical models.
vanguardminiatures.co.uk
Also BattleFleet Galaxy
We sell ships of gothic design that is part of our Battlefleet Galaxy range. Discover a new line of Imperial BFG ships!
battlefleetgalaxy.com
Here is another base I did up to try out, on my super dusty table.