They put it into the oven to ensure it is dried thoroughly. It is not come close to a kiln.
For colonies like that, you are going to have to keep expanding the nest.
Have you considered buying a cheap $20 dremel kit (http://www.ebay.com/...=item259d5b00b5) and then making a formicarium out of a bead container? Or even borrowing a friends or family members drill/dremel?
Tutorial on how to build here: http://www.formicult...icture +journey
This would allow you to simply keep attaching more nests as the colony grows. And having a dremel or drill would give you more options in the long run.
Who said we could only use one test tube? Look at the second last post on this thread - http://antfarm.yuku....es#.VLFJXnst6OZ
Depending how good you are with vinyl tubing and acrylic - http://antfarm.yuku....-test-tube-rack
Or here is another thought. If you don't want to use any tools at all, you could build a nest in an outworld.
About half way down the first post here is a section on how to have both a nest and an outworld in a container - http://www.formicult...icture +journey
Make a clay tunnel network against one wall of the container, tilt nest on side and pour in grout or hydrostone. Let dry, remove clay and then silicone the nest into container. No tools or drilling required.
Or you can make one outside of the outworld and simply put it in like I did here. I didn't use any tools on this one.