The kit looks very nice in the box and is surprisingly big,I always imagined these gliders to be quite frail .You get two options to choose from , the Mk 1 or the Mk2 , and for this build the correct choice is the Mk1 ,the Mk2 is slightly longer and so for me the first step is to cut away the unwanted section of fuselage from just aft of the cockpit, also the Mk1 has a larger door and this also needs to be opened up, this is quite sraightforward as the moulding has a "cut line" to follow with your craft knife.
The next step is to construct the larger door which is in three sections as it was in the real aircraft.
Well that is as far as I have got up to now.
Cheers N.
7 attached images. Click to enlarge.