The Japanese info on Nejire Dimension says this: There is the translation: I guess the dimension is the same size as our universe based on the first line. Usually, the Nejire Dimension is seen when the Grand Nejiro appears on screen. And we can see Javious's energy body when he dies in episode 43. Javious's body is bigger than the Giant Nejiranger. The giant Nejiranger and Megaranger's mecha are equal in size. We also don't have info on the Grand Nejiro. But here is the size of the UFO compared to Yokohama Landmark Tower. Some info on the Yokohama Landmark Tower. I hope this help with Grand Nejiro's size. Number of floors: 70 floors above ground, 3 floors underground, 3 floors (tower building) 5 floors above ground, 4 floors underground (plaza building) Site area: 38,061.51 m²Building area 23,208.29 m² Total floor area: 392,884.85 m² Office: 166,000 m2 Shopping mall: 74,000 m2 Hotel: 83,000 m2 Parking: 60,000 m2 Other: 10,000 Structural type Steel frame structure...