As far as I can tell, it had a different name in 1999, it was called "Electronics Australia with Professional Electronics & ETI" and then
changed back to Electronics Australia in December 1999.
So maybe try a search for "Electronics Australia with Professional Electronics & ETI"
I notice that Silicon Chip will sell you a copy of "The Brick" construction project from June 1999, for $10. Seems like a ripoff to me.
www.siliconchip.com.au
Also, there is an archive in the National Library
https://catalogue.nla.gov.au/Record/2947337 but you might have to go to Canberra to see it.
If do go to Canberra, please check out Grilled Pteryodactyl, I'm curious.