A330-200 ST BelugaXL

hello I'm doing a project to create the A330-200 ST belugaXL in scale (1/300) although of course it only adds the wings. the base of the wings (the part that holds the wings in the fuselage). the elevators and engines of an A330-200 and expanded the central fuselage of beluga A300-600ST (the central part of the fuselage ) to the same size of the A330-200 relocate gaps parts of the space and I propose to put some parts of aircraft so that the model is better (since I get that the upper load gate can be opened and closed to put a useful load there) so what do you recommend doing or modifying