those dimensions sound pretty close to what i have initially carved. it is 275 feet to the front of the island from the pro tee. (this is the PRO tee, not the advanced tee).
the pin is 25 feet from the left side and the front side. it is 50 feet from the back side and the right side.
the drop zone is 180 feet from the closest corner of the green to the drop zone and the approach to the green is from the side rather than from head-on like the pro tee is.
i only carved the green last weekend so there is limited playability to tweak dimensions and tee and pin locations. havent yet figured out what happens if one misses the green on the initial or subsequent drives. i.e. when does one go to the drop zone... also havent figured out yet what to do about the short tee (aka the drop zone) as a total novice cant be expected to throw 180 feet to an island green. the reason for the design of this hole is to utilize a big wet area with random dry areas (islands) that sits right at the entrance to the 47-acre property so the hole will be very visible from the main road and the 3rd hole of the warwick course across the street. its too wet to allow for a fairway between the drop zone /short tee and the green.
any thoughts on how to handle play from the short tee are welcome.