DodgyOpsGuy,
In order:
1) Yes, completely ready in 4 years is a slam dunk. The S-92 program is in full swing, the first year is fully sold out and the second is going that way. First aircraft will be delivered in a few weeks, and lots more are running down the line at Bridgeport CT right now.
2) That door has a sliding section that telescopes as the door slides against the sponson, and the sponson has a slot against the fuselage. Kind of like some of those doors we see on trains and the like, where the mechanism allows them to fold into impossibly small spaces. Works nicely, all in all!