Right now i'm on 3-6 pints of whole milk per day. Sometimes a little more, sometimes a little less. When it's less, it's normally replaced with full fat yogurt. I eat loads of yogurt and/or drink loads of milk. It's not quite GOMAD, though. I already eat pretty well but life (and some kind of Ulcer or something) got in the way recently so I just said 'screw it' and went on the milk and yogurt to make up the deficit quickly. Was supposed to be a short term fix but i'm loving it. I also generally eat around 6-12 eggs per day but it depends.
One thing I can say is, Saturated Fat makes you feel amazing.
Don't worry about body fat unless it gets out of control. If it does it won't happen over night so just keep an eye on it. Also, you need your intake to be 'excessive' not only to gain weight but to also perform well in the gym. I've had my calories at a 'sweet spot' for ages now but after throwing the rule book out the window and eating loads more, i've felt amazing in training, hitting various PR's. I've decided to keep it going until around February.
The leaner you are the weaker you are.. Just eat lots, get strong, THEN worry about getting cut/ripped/jacked/swole/tanned/shaved/whatever....
Of course if you have the discipline, getting 'excessive' calories from mostly lean protein sources and veggies, with occasional grains thrown in still with a high fat intake, then you'll do even better.