The Ursa Mini's sensor isn't upgradeable I'm afraid; this is possible on the "Big Brother" Ursa.
Great video, well done! And the campaign raised $30K, so it worked!
4K at $3200. Still cheaper than an A7s + Shogun, yet double the GH4. Is Sony on drugs?
Your work is really great! I love how you experiment. If the camera works for you, keep working it!
Considering the hoopla with the expense of CFast, this product could soften the blow, while letting you record at length on SSD drives.