I noticed this mole cricket in my driveway today and took his photograph using a 90mm macro lens and a 1.4x teleconverter. I'm not sure how much magnification you end up getting with that combination and a D70, but it is something past 1:1. With that, the depth of field isn't much. This was shot at f/10, which sounds weird, but is the result of the macro lens.
He was about an inch long and as big around as a pencil. Anyway, does it work for you?