I have made BMCC 4K 3dprint sun hood and eye peace. The hood worked ok but the eye peace is far better. You will need to buy a dslr lcd magnifier on ebay to get the lens and rubber cup. https://www.thingiverse.com/thing:3698495
It is not perfect but it certainly make the camera more usable outside and hand held due to the eye peace being a third point of contact.