This is how a Mini Kossel looks like (please click on the link to view the pix on Johann's Fllickr album as I've not gotten permission to post it here): http://www.flickr.com/photos/jcrocholl/8730999022/.
From the description, he was using 15x15 aluminium extrusions for the structure. Terence managed to find a source for the exact type but it seemed that the dealer in SG doesn't like to deal with personal purchases. My email to them went into twilight zone...
I know a few places selling almost the same and so went checking. The smallest I can find is the 20x20, which we bought 2 sets for our project. The shop at King George's Avenue will only cut to shorter sections for ease of transporting the 5m length. Good enough for us as we both own a horizontal bandsaw.
I received a good news from Terence just yesterday; he has completed the modification of the extrusion connectors and did a test print. Result was good. He went on to print some for me in blue. I've just gotten back from his place with the parts. They are so much nicer and the fit astonishing well!
Some pix to show off his work from his tweaked Replicator 2:
More stuff to acquire the next few days. We'll try to make whatever we can and buy the rest. Once we have the basic Mini Kossel up and running, we'll be looking at modifying it.
That's all for now. Be blessed!