The rescue hoist was mounted above the right front seat and the rescue hatch below it so it had to be removed or folded forward for hoist operations:
There were several instrument panel arrangements. The top one was BuNo 128503-128600.
The cabin interior ended at the attachment point for the aft main landing gear strut;
The engine was mounted aft of the hole in the bottom of the fuselage and backwards, so the drive shaft pointed aft and the engine exhaust stack was forward of the engine.
The engine was mounted at an angle and drove a gearbox that had outputs forward to the front rotor and upwards to the aft rotor.
For an excellent review of the Amodel HUP kit, see http://alexsmodelling.blogspot.ru/2017/03/hup-retriever-amodel-kit-review.html