Coley,
Sorry for the delay,I've been under the weather the past couple of days.
I generally use pine,and turn them on a lathe.It's going to be hard duplicating something you don't have to use as a pattern.I'd start off with a 3/4 x 3/4 x 5" piece of wood and work from there.When you get it shaped the way you want,drill a 1/4" hole in very back/bottom of the lure.Now pour some lead in this hole.Just as the lead is setting up(a second or two)press the lead against a flat surface to pack the lead in the hole.Now put the lure back on the lathe,and sand the leaded area smooth.Don't drill it so deep that it effects putting a eye screw through the back.
You may have to adjust the wood size,amount of lead etc. until you get the effect you want.This should give you a starting point...also, besure to keep good notes so you remember what you did..Nathan