Environmental report for Terminal B reconfiguration and Terminal C-E connector projects, contains a few schematics of the various arrangements considered along with what has been proposed.
http://www.massport.com/environment/environmental_reporting/Documents/Environmental Filings/2012_EA_Terminal_B_CE_Complete.pdf
http://www.massport.com/environment/environmental_reporting/Documents/Environmental Filings/2012_EA_Terminal_B_CE_Complete.pdf