The most-effective, cheepest, no-smell, no-mess, mouse trap that I have used is made with a plastic bucket with a wire handle, an aluminum pop can (or as the Americans would say, soda can) and a wire coathanger. Straighten out the coathanger, poke a hole in the centre (or center) of the bottom of the pop can, insert the coathanger in the hole and out through the pull tab hole in the top (yes, you can, and should, drink the contents first). Secure the coathanger through the mounting points for the bucket handle and bend the ends down so that it is hooked onto both sides of the rim of the bucket. Make sure the can will spin on the coathanger - this is ABSOLUTELY KEY. You may want to bend the coathanger a bit at each end of the can so it stays centred (or centered) - it will become obvious what to do when you start. Apply a strip of peanut butter around the middle of the can, at a right angle to the axis of the can, and add 3 inches (say 10 cm) or so of water. If this is in an unheated garage add some antifreeze, although I think the mice will have hybernated by the time it gets that cold. All of this only takes a few minutes to make. Voila, you have the trap. Now, as for location, put it somewhere in the garage near the NSX where you won't trip over it and make sure the mice can access the bucket - put a wood ramp or something. They don't need much. The peanut butter attracts them, they walk out the coathanger to get at the peanut butter (they think) and get on the (by then spinning) can and fall off and drown in the water. Periodically, dump out the water (with the mice), refill and continue. The peanut butter seems to last forever. Good luck. But it won't help with the cat - unless you put a lot of anti-freeze in it!