I'm presuming you don't have a nice full bits box to scavenge cannon-looking bits from. I've used things like WHFB dwarf cannons before, with orky details added of course.
Plasticard tubing is certainly the simplest way to scratchbuild the barrel of a kannon, which is usually the most difficult bit. And you'll need some sort of wheels for the gun carriage.
But as you don't have any plasticard (you don't want to order some online?), you may be better off looking at cannon-ish things you can orkify. Definitely have a look through local toy shops and 'dollar shops' (or local equivalent) - although most toys are either horribly toy-like or stupidly expensive, now and then you'll find something cheap and effective, But even then, plasticard makes it much easier to orkify them.
Unless they're for friendly games only, also keep in mind the size should roughly match the GW models, aroun 5cm wide and high, and about 7cm long including gun barrel.
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