Here is the instructions regards the resin adaptions for the Mirage F1AZ as supplied with the set by Scaleworx.
Hope it helps see how much of the original kit is used. The adaption constists of new canopy x 2, resin nose section, resin jet pipe, rear under fuselage straks with chaff dispensers, various small adapted pieces (vents, warning detectors, etc), new main wheels, new nose gear doors,