See Map10a

for a mod that gives planets equivalent to sphereworlds (NexusHuge). Also the other sizes down to NexusTiny which is 1/5 the size of Huge. The planets are randomly generated at map creation about 1/5 of the regular ones. It makes an interesting start since due to an oversight by MM the initial homeworld placement looks only at the size class, not the actual size by name. Some AI get 8x planets rather than regulars. On a ten planet start it varies all the way from all 10 normal up to about four Nexus style, giving a ratio of 40/10 for the most advantaged. On a single planet start they are either 8/1 or 1/1 of course....

The facilities and population fill up to the actual capacity of the world, which is an impressive list indeed! Some AI would be automatic MEE at turn 1 if set at 500k on a ten good planet start...