A great mod. I suggest however, to use 'cargo' as a resource instead of ores you have to mine. I believe the Orbital Construction mod does something similar. If you want to build a rocket consiting of an orange tank, a mainsail, a decoupler, a capsule, and a parachute, you'll have to fly those parts to your colony. 'Disassembled' perhaps, in a special container. A container can carry a set amount of weight. You can only use the parts that are in stock in your extra-planetary launchpad to build a ship. Could give it a more interesting angle and give you an actual reason to make regular restocking flights.