Than I used my rolling-pin to roll down this 'clay pastry' into thin layer, as if I was going to bake some cookies ;-) It has to be made slowly and carefully (you'll get the trick in time) not to tear the clay. The rolled down clay should be cohesive, firm and aproximately 1 cm thick looking like a huge, thick pancake.
As you can see, using this method one is able to create some fancy patterns as the two tones of clay mix together smoothly giving this interesting, marble - like effect. After I had my 'pancake' rolled down, I measured and cut the desired shape of a rectangle big enough to cover the cage tube (my mold) and freely reach the ground with both it's ends. One need to be very gentle while forming.
The pictures show I helped myself with two little glasses: I put the whole construction on them since I needed the tube just to provide this curved shape of my tunnel. There's also one detail you may be interested in: do you see this small something on the top of the tunnel...? Well, this is the joint part that will fit an adequate hole of the main chamber section. See, how smart you can get?
When I considered the tunnel section finished I left it to rest since the air drying clay needs few hours to harden itself. Keep in mind, that during this process, the clay (always!) shrinks a bit loosing it's capacity. So, what's next...?
It really doesn't matter that much whether it's straight or not. Just try to keep it as neat as you can, your hamster will enjoy it anyway ;-) In the meantime, while it's drying, you can make the last part of the burrow: the main chamber cover.
Since it's the last part, you may get crazy a bit and use all the clay that's left in the sculpting process ;-) Take all the steps like: measuring, mixing, rolling down and cutting the clay to get the desired lid shape (it may be round, but it may be rectangular as well, the sky is the limit). I chose a common circle and added three 'blobs' of clay in it's down side making an additional edging to keep the lid in place better but they're not necessary (Nutka ate them anyway LOL).
Having the lid hardened I realised that I'm not pleased with it's look. I got plenty of clay left so I used it to upgrade the lid and make it look like a real cover (I even added a little heart on the top of it, LOL). It took some effort (wet sculpting all around the edges mainly) and needed additional forming directly on the main chamber section protected with the foil, but it was totally worth it.
The construction was left like this untouched for next three days to let it dry definately. I wanted to make sure that all the parts harden properly before I put the burrow into the cage and leave it to the beasts ;-) The lid cracked a bit during this process (the clay shrinking, remember...?) but I didn't mind: it was like a scar on Harry Potter's forehead LOL, the visible sign of love bursting from my clay heart on the top of the lid ;-) Nothing left do be done but cleaning.