The hatch is moulded into the undercarriage bay, which in turn is glued to the underside of the cockpit, had the inner gap all round so I boxed it in with the plasticard.
Thanks Very much Guys....on to the rear pit now...
Cheers Hugh, ok into the back end of the fuselage/cockpit area...filled the 'holes' with plasticard and sanded smooth and now started the internal frame work on the starboard side...
Well John, Roughed it out...dryfit...sand slightly...dryfit...sand slightly...over and over till I got a perfect drop in fit! spent more than half an hour on it...sometimes I get a little anal about getting things to fit just right when other stuff is going to be overlayed on top.