sprocket hub

I need to get the hub itself off (green arrow) Do I do this by somehow removing those nuts (red arrow)??

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You got it.You need to remove both of those axle nuts and the sprocket hub will slide right off.Put a wrench on both axle nuts turning the outside one counter clockwise and the innner clockwise.Once it loosens remove them both counter clockwise.Reinstall them the opposite way.Basically you need to lock them two nuts back together.If interested I have a blaster axle and sprocket hub that I will sell.Good luck
 
You got it.You need to remove both of those axle nuts and the sprocket hub will slide right off.Put a wrench on both axle nuts turning the outside one counter clockwise and the innner clockwise.Once it loosens remove them both counter clockwise.Reinstall them the opposite way.Basically you need to lock them two nuts back together.If interested I have a blaster axle and sprocket hub that I will sell.Good luck

Will try it in the morning. Any idea what wrench size I'll need or if there's a better option? Also, once I determine what parts I need, I'd definatly be interested.
 
Same here,I use 2 very large adjustable wrenches that I bought for $20 a piece.A pipe wrench will work also but will most likely leave some of the tools jaw marks in it.You can always wrap some tape around it to soften the marks.