The Cobra kit is a good way to go. I wish they would come out with the fire suppression pack they carried under the aircraft. The interior was rather sparse with the internal framing covered over with red cargo nets down to the low sitting metal bench seats. the only paddes seats belonged to the pilot, co-pilot, and medic/mechanic which was located at the opening of the right side door. Even that one was not much more that a padded seat on the cargo floor with a padded back rest. In S.E.A. the clamshell doors were removed and a yellow cargo net was placed across the rear opening. They also carried a force jungle penetrator that was stored vertically along side the mech. seat and I believe it was held in place by a metal ring on the floor and a metal strap that locked much like a fire extenguisher, that was attached to the forward bulkhead partly behind the co-pilot's seat.
I haven't looked at my Cobra set lately, so I don't know if it has the loudspeakers in the front, the flood lights on the bottom or the optional float packs the mounted on the sides below the level of the doors.
I picked p a bood on the Pedro in Barnes & Noble. It's part of the Schiffer Military Collection and by Wayne Mutza. I also have a copy of the flight manual from a place called Crystal Publishing Co. in San Antonio. My copy is dated 1966, updated to 1972 and includes changes, operational and safety suppliments.
If yo need anythin else, let me know. She made for an interesting ride but was still my favorite.