Never seen a chipmunk trap like that, but I'll give it a try. I'm seeing more of them around our place, and I don't like the idea of them burrowing into the foundation, etc. I wouldn't mind reducing our squirrel population either, maybe this will work for them too. I've seen some wide pedal traps that look like they'd be ideal for this little job.
It seems like a lot of altitude between top and bottom: is that just because you used a single piece of 12' wood, a convenience thing? Have you found any particular bait works best?
DaveO
Oxweld oxy acet gear
IMIG 200
PowerTIG 210 EXT... Amazing!