My very-difficult-to-test hypothesis is that it's a comination of boom states and buying and selling modules at the station, but to be honest I haven't a scooby how it works.
There is also a hidden variable in the BGS called "tech level" which directly affects ship availability in the shipyard. I recall a patch note from years ago saying that Phekda's tech level was altered to 3 (IIRC) so that there would be at least a couple of ships in the shipyard - previously, it wasn't possible to buy a ship there.
There is also a hidden variable in the BGS called "tech level" which directly affects ship availability in the shipyard. I recall a patch note from years ago saying that Phekda's tech level was altered to 3 (IIRC) so that there would be at least a couple of ships in the shipyard - previously, it wasn't possible to buy a ship there.