I think the art he's refering to is now called Muay Boran, the art Muay Thai evolved from. If you've seen Ong Bak, that's the style they use in the movie. I thought the only place they still taught it was Thailand though.
And i agree with all the previous posts, you need to eat more man. And if you put on a bit of fat, who cares? I bulked while i was doing Muay Thai, and just cut down before comps. that way i always seemed bigger than the other guys
Oh and a more logical progression for your program is from bigger muscles/movements down to smaller muscles/movements. So instead of starting with the calf raise for legs, end with it. And a more logical split would be something like upper body/lower body, Chest/tri's, back/bi's, shoulders and legs, or chest/back, shoulders, arms and legs.
Concentrate on big compound movements, especially if you're looking for more size and strength and focus on overall development rather than a single body part (e.g arms)