Plan looks good to me. have you done any half-marathons before, and if so how did you train for those? the only thing i'd ask about is the calories youve listed. 1400 is pretty low for 10 mile runs!! you might want to consider hitting closer to 2000 on your long run days. then again i dont know what youre used to, just that im a girl who feels like shes starving if i eat under 2000!
i think the weight wont be an issue with that training plan, as long as the foods you eat are nutrient packed and varied.
good luck and keep us posted on your progress!!