A few more details have emerged as part of an arena and land-swap plan currently being considered by city and state fair officials. A plan laid out by developers Gerry Kamilos and David Taylor calls for mixed-use private development of city-owned railyards land and the current state fairgrounds site. That development would help finance a $400 million sports and entertainment complex downtown and new fairgrounds in North Natomas, according to documents the city released late last week. The "Sacramento Convergence" development team, which includes Macquarie Capital, would invest $600 to $700 million in private equity and debt in the project. The developers also propose other funding mechan