I am extremely ectomorphic, and I tried to bulk at one point, only watching the amount of protein i got, and just eating whatever really. But I noticed out of all the weight I gained, very little of it was quality. Beyond that, I felt like crap most of the time. I am a big supporter of staying pretty lean in the offseason, and eating pretty clean year around.
I wouldn't eat every 2 hours in the off season, but still probably every 3. I personally try to get 1.5 grams of protein and 3 grams of carbs per pound of bodyweight. This works for me, but maybe not for others. I generally eat the same stuff everyday, but probably have two cheat meals in a week.
-Jake