Just read through these threads again recently. Hope you don't mind the dumping of this info in your thread, but figure it's useful.
http://www.viczcar.com/forum/index.php?topic=16036.0
http://www.viczcar.com/forum/index.php/topic,13263.0.html
Be-Zed (Aubes) mentioned car #12 being in Brisbane.
http://www.viczcar.com/forum/index.php/topic,13263.msg142934.html#msg142934
#63 ended up in Perth and was a Melbourne Auto Show display car back in the day. (white w/blue interior)
http://www.viczcar.com/forum/index.php/topic,16040.msg169702.html#msg169702
Dale owned #36 back in 97.
#39 is at Ledge's shop in South Australia.
https://www.facebook.com/CustomAndClassicCars/photos/pb.517478251606641.-2207520000.1438400186./836914396329690/?type=3&theater
https://www.facebook.com/CustomAndClassicCars/photos/pb.517478251606641.-2207520000.1438400194./807416605946136/?type=3&theater
WA Z Register.
http://www.wazregister.com/index.php?title=View_ANZIS30_Register_Cars
So let's see.
HS30 00004 (Melbourne collector, last I heard... not sure still in AU ).
HS30 00012 (Brisbane)
HS30 00016 (RB26 with flares non-original car)
HS30 00019 (Your car)
HS30 00030 (Tasmania - WA Z Register)
HS30 00036 (not confirmed still exists) - Have to ask Dale.
HS30 00039 (Ledge's shop)
HS30 00044 (NSW WA Z Register)
HS30 00051 (NSW WA Z Register)
HS30 00063 (Perth with collector/enthusiast)
HS30 00084 - Great unrestored condition. (link here).
HS30 00117 (WA - WA Z Register)
HS30 00121 (VIC) - Dimitri (confirmed I've seen his car many times)
HS30 00131 (ACT - WA Z Register)
HS30 00145 (NSW - WA Z Register)
HS30 00149 (Lurch) - Confirmed seen this car before...
HS30 00150 (ME) - Confirmed
HS30 00151 (Shannon's auctions a few years back, confirmed)
HS30 00157 (QLD - WA Z Register)
HS30 00165 (Was on CarSales not long ago link here, was butchered, now being turned into a Ferrari GTO replica) - Spoke to new owner.
HS30 00181 (SA - WA Z Register)
HS30 00183 (QLD - WA Z Register)
So we know about 11 cars in total under HS30 00100. Considering some went to NZ, the UK, Australia, possibly ZA (South Africa). Who knows how many more there could be? Not many, and in what shape? Original? Modified for racing? Wrecked? Rusted? Bent?
Survival rate is looking like ~10% so far...for the very first cars in Australia maybe less?
Under HS30 00200 - we know of 22 cars (1 being turned into a GTO). So again this suggest a 10% survival rate and verification of certain cars is not easy and who knows if the details on WA Z Register are accurate or just details people have entered because they once owned that car. Not necessarily know if it still exists.
Between 200-300 there is 7 cars.
Between 300-400 there is 6 registered cars.
I'm sure I've seen a few more on eBay / Gumtree recently in the 300-400 range, all in very average sad state.
All this suggests less than 50 good cars (maybe 10-15 great examples max of original condition cars) in the HS30 00400 range and under. Wow!