Several different camouflage waterproof lens covers are already available for the Nikkor Z 180-600mm f/5.6-6.3 VR lens:
EasyCover Lens Oak for the Nikkor Z 180-600mm f/5.6-6.3 VR (see more EasyCover products).
Chasing Birds camouflage waterproof lens coat for Nikon Z 180-600mm f/5.6-6.3 VR (see more Chasing Birds products).
RolandPRO waterproof lens camouflage coat for Nikon Z 180-600mm F/5.6-6.3 VR (see more RolandPRO products).