okay, so one of my cats, kiska, has these catnip-stuffed fabric mice she plays with. sometimes she'll bring them to me, and announce her "catch" when she comes up to me, with a very distinctive meow. well, she did this last night to me around 3 am, and i was groping around in the dark to find it and throw it for her. i grabbed it and noticed that it was furry. and heavier than it should have been. she brought me a real dead mouse! 
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I don't think it would be that hard, actually. The most important points would be using rough-sawn lumber and making sure the spacing was proper. I can imagine it being a bit of a challenge with the spacing if you don't alrealy know exactly how thick your boards are, and they can vary quite a lot. Too much space and I think it's not snug enough for them, too little and they can't really use it.
If you've got a drill I bet you can put one together for less than $60.
Not that you (of all people) need telling, of course.
I'm sort of thinking that a shallow taper would work OK, at least for the first try.