Heres your answers:
3. No, the legobases completely blow for building on you might as well give up. Until the next RTB update comes out (I don't even know if it will be fixed there)
2. Those guns aren't in the game yet but, somebody might turn Venom's models into weapons for blockland.
1. RTB doesn't have a tutorial on commands but, I know the command to spawn a guard bot is commandtoserver('spawnguardbot');