I'm not that big on local, but double for a $6k mooro vs $1500 for direct sourced with virtually no difference is a huge gap. If you were going to insist on local, you'd want something tangible. Bastion offers that but is obviously expensive. Baum is very expensive for what it is. Unless you were personally meeting the frame builder and getting measured up and all that then very hard to overlook overseas pricing. The problem is welding Ti is not as easy as steel and economies of scale certainly make a huge difference not with just manufacture but sourcing of material. Those folks at waltly can source Ti for prices that a local frame builder cannot even dream of getting chromoly in. Then add the efficiencies with a production line and jigs and all that and it stacks up significantly.
When I was looking there are quite a few outfits that do the local service part of this and then order the frame overseas direct which should be an option. Sourcing the frame overseas shouldn't be completely ruled out because the reality is all you are doing is getting the local frame builder to pay the chinese guy instead of you doing it directly. If you want local consider getting the design and fit and measure done here and with a shop that has links to manufacturers. If you are in Melbourne I highly recommend BikePro who does frames in steel and Ti. His bike fitting service is quite reputable.