Kadena AB was the operational B-29 base of the Okinawa island chain (Ryukyu Islands). And it never served the B-29 during WW2. It came online in '47 and served B-29 units during the Korean conflict only. If you're building this for historically-accurate CFS2 WW2 relevance, it would be a waste of time.
The only operational B-29 Pacific bases (not counting Asia) were in Iwo Jima and the Marianas. At present for CFS2, we have the B-29 bases of Guam Northfield, Tinian and Saipan. I have them all installed but i only activate them when flying B-29's in FF sessions (don't have any collections of missions yet). They are all circa 1945 works so they don't need activation unless i'm flying missions in that period with other aircraft that take me near them. They're all well-done projects, but also frame hogs created with older design tools and techniques.