I have a couple questions ad I finalize my list of the megabattle:
I built one of my Nobz units using the Black Orks from WarHammer Fantasy.
1) Instead of putting the slugga on that is base, I used a second choppa. Given that a slugga gives me a shooting attack and an additional attack in close combat. and a second choppa would give me an additional attack in close combat, i.e. eliminating the shooting attack(but a second choppa is not actually an option for Nobz). so, because I'm not actually gaining any different advantage and am only taking something away from myself(a shooting attack), would this be allowed?
Sure, and in fact I'm sure you could just use it as a normal Nob. WYSIWYG is great, but in such a massive game like this, nobody will really be affected by you not representing them having a pistol. Chase and Derek are the final word on that, though.
2)When building this unit, I built the Musician with drum and drumstick. Would I be able to use him as a Painboy? or is that too far of a stretch?
Again, for such a simple thing, I don't see why not. Goss has a good point - maybe paint it like a medic.
3)I have a Killa Kan with a Kustom Mega-Blasta that is built using other random pieces. Do I just post a pic of it on this thread for approval? or how do I go about getting approval?
If it's a conversion for an actual weapon, I don't believe you even need to do that. This thread is for people making their own models, making up their own rules, etc. If we needed to post for each conversion... this thread would be 100 pages long.
You don't need to worry about a lot of this stuff. Much as some things would make it hard to believe, the megabattle is about having fun. Worrying about whether or not a weapon that something that, relative to the things that will be on the table, is the size of an ant looks right won't change the dynamic of the game at all.