Will the Arcadia be the only Station able to actually build the capital ship or do you add other stations as well, given time.
Other stations will come. The Tevs have the Ganymede, the UEF has two more stations, I can always make stuff from Polaris pieces or Black Wolf's kit. There is also, of course, the UEF Faslane shipyards, the ones that built the first Orions and the Solarises.
About the resources: What about adding the logistic ships, so the collectors can dump their REs there, would be sweet if the Anemoi could repair ships.
Logistic ships will have a field repair, mobile construction and AoE buff effects. Gas miners will most likely be able to dock with em. But since deathmatch hasn't really been my focus, I haven't been working much on resources mechanics.
Have you planed something like missile lifetime? Playing deathmatch and some missile are flying over the whole map, when my ships retreated.
Hum, missiles
already have a lifetime, the same as in BP. However, we're talking of range from 36 to 72 seconds here, which means that, since IIRC the deathmatch map is pretty small, you can probably snipe the enemy base from your own base with Narayanas.