If you're only looking at a max (seam) thickness of 7-8mm then any of the upholstery-class machines should do, they generally have about 10mm under the feet (some will do 12mm) and can usually manage #138/M20 thread. Singer 111/211, Juki 562/563, Consew, Seiko, Pfaff, Adler are all older machines that you might pick up at reasonable prices (well, maybe not Adler so much). Just search for "industrial sewing machines" on gumtree, where you are gives you reasonable access down to Melbourne and the suburbs so you've got a pretty good chance of finding something, just keep looking. If you see something and aren't sure just ask on here.
Buying new is nice but bloody expensive here in Oz, particularly if it's only for occasional/part-time use.
Bert, I reckon you're right about the glue.
Edit: I just had a quick look at gumtree and saw at least 3 132k6's in Vic, one of them is at Echuca (!) but he wants $1750 for it, which I think is a bit on the high side myself. It does have a servo, but servo's are pretty cheap on ebay ($100 - $120).