While I like the idea of the model, however it has a balance and ratio problem.
Balance: The Shokk Attack gun over powers the rest of the model. While the orginal
SA gun is big but it is balanced out by the backpack and the snotling suction tube on the model's left side. The left arm from the runt herder model is way too small to balance out the model.
Ratio: The
AoBR Warboss is an excellent ork template to work off but it is hard to utilize other ork bitz since the model's arms are so large. If you are going to use the orignal twin-linked shoota arm you need to use one of the same size on the other side. This is where ratio comes into effect. Boyz size model parts have a hard time scaling up to Nobz and most is almost impossible on a Warboss. If you are going to use a boyz size bitz on a warboss use it as a basis so to use
GS to build upon.
A betted use of bitz would be a to remove the
SA gun and construct one using the combi shootas that come in the Nobz box. that way the both arms have a correct ratio thus reaching a correct balance within the model.
Sorry, I am not trying to be an

but these things are not explained real well in
WD or on most websites.
PM me and I can give you some excellent tips on converting orks.