about your list: make the orc boyz choppa shield, not to choppas, it will save you a few points.
Anything with 2A is pretty much a waste in large units in 8th edition, due to the fact that you can attack in 2 ranks but only 1 attack per model after the first rank, so thats wasted points, where in 7th edition you would've doubled your attacks.
also, I would suggest downsizing this unit to, say, 30 and make the unit of nightgoblins 30 big or preferably more, and give them a banner and a musician.
also, putting a cheap bigboss with a great axe in it, is never a bad idea.
personally, I like gaints, they eiter suck, or do real good (but they seem to prefer the former

)
but theyr great fun to play with, and thats what O&G is all about
also, when playing agains
DE I would suggest taking a doom diver instead of a rock lobber.
hope this helps