low fat raw and building muscle

Was going to fast to lose weight, but think I really need to build muscle.
Trying a low fat mostly raw vegan diet to do so. I plan on eating as much as I want as long as I feel satisfied and walking 3- 6 miles everyday possible, and working up to jogging.
I did recently lose like 70 lbs in the past few months crash dieting, but notice some saggy skin developing, so I would like to conserve and build as much muscle mass as I can, while I continue to lose weight. Have like 60 more lbs to go.
Anyone with experience doing this or losing weight this way? Tips? Tweet