It could maybe be possible to put retracts on the Mag, but it is not the ideal model for this. Because you may have problems finding a suitable retract for the fuselage... Usually you retract the undercarriage into the wing, but on the Mag you need one which fold backwards into the fuselage... And you have to plan and prepare everything before you put the fuselage-halves together, making brackets, fitting servoes and so on. Don`t think it is worth trying on this model...
But if I had been challenged to try I would have rebuilt the plane for tailwheel, not nosewheel. Then looked for a scale retract which retracts backwards. Something like the Cessna 185RG...