Okay, so I did something dumb. I totally forgot the AOBR orks have their right arm attached to their bodies (I'm sure by design by GW). I still have a butt load of burnas (20 of em to be exact) and have gone ahead anyway.
I did a test model first and found I can chopoff the arm and, with a little bit of GS filler in the arm cracks will have burna boyz.
So why have I posted this? My question is are there others out there who have ran into the same situation and if you did what was your solution. Also, before I chop off the next 19 arms did you find any particular model/spot to chop or alter the origional model so it fits better?