RD,
Try these mobs

These blokes do state that they can do that work
Sunshine Coast Gunsmithing
Phone/ Fax: (07) 5485 3372 | International: +61 7 5485 3372 | Email: info@scgunsmith.com.au
Address: PO Box 237, Pomona 4568, QLD
http://www.scgunsmith.com.au/services.htm

or

Maybe not so much these fellows - but their work is very good, possible?
GN Olsson Mastercraftsmen gnolsson.com
Brisbane, Gold Coast & Sunshine Coast
393 Narangba Rd, Kurwongbah (Brisbane)
Queensland 4503, Australia
Phone (national): 07 3888 1549
Phone (international): +61 7 3888 1549
Email: gnolsson@bigpond.com
Website: www.gnolsson.com
http://www.gnolsson.com/other/Rare_trade..._Gold_Coast.htm

Cheers
93x64mm