Portland?! It's out of my maximum operation range.....
WOW! you're the guy modified the Kiowa Warrior?! It is sooooo cool! Is that an ARK-400 you used? I got an ARK-400 too... Maybe I should pay a trip to Toys-R-Us I am currently working on an OH58D project, so have kind of special feeling about this model
The one in my KIOWA was zoom shogun pro3D. I did not have ARK-400 so I don't know if it will fit inside the KIOWA or not. But definitely give it a try. Even the shogun 400 was a tight fit, there's no too much space left for the main gear to spin. However, if you want something even bigger and give you large space to work on, try pavehawk or apache. They all are the same super detail models from BBI, and all can be found in ToysRus.