The engine comes w/ ancillaries that you bolt on to a bare block. What it includes depends on which spec Roadsport you want to get, ie the 170hp or 210hp.
Seems like most owners w/ the duratec think that the 1st gear is too short, but Caterham sells a T9 w/ a taller 1st gear or you can opt for the 6spd. There are various other aftermarket gearsets too.
The spare is an option thats comes w/ the carrier, it costs $586. Not sure about the tire sizing. I also looked into the tire sizes and 195/50 is much more common. Hopefully someone w/ a 7 can add some input whether there is enough fender clearance for the slightly taller tire.
The paint is optional. The car comes in bare aluminum w/ the choice of black, red, green or yellow colored fiberglass pieces.
Hopefully that helps you out. I believe there's a few guys in your area w/ 7 that you can talk to in person. Scannon is in that area he has a Caterham SV w/ a turboed miata drivetrain.