This complete conversion set allows the modeler to build an accurate 1/32 scale model of the first production version of the Griffon engined spitfire MK Xll , to see service in the RAF during WW2 . I have built this conversion around the Revell mk2a but can be built upon the hasegawa / hobby boss kit with a little filling And shaping ,the cowl assembly is cast hollow so is very light and will not put any strain on the under carraige . the easiest build would be on the hobby boss mkVB as all the cowls are separate , this means that you do not have to carve up your Revell spitfire , which takes a bit more work /skill and time to complete . This set comes with everything that you need , other than the model kit to build an accurate model of the mark Xll spitfire . The parts include a complete one part cowl assembly , spinner , prop rear plate , propellers x4 , exhausts x2 flat type , broad chord rudder , MG covers C wing ,hispanos x2 , stumps x2,large air inlet ,And replacement wingtips , ( this builds into a model of a high back Spitfire . (set 014). please see build photos  .please note that the cowl section is totally hollow so the weight is similar to the plastic model and sit well no nose up .also note that the photographs are of my actual build of the revell kit and my conversion set, the best fit will also depend upon your skill in removing the moulded on cowls , the model can also be built on the hobby boss MkVB kit this may be easier as the cowls are provided separately so less cutting involved but a little more shaping and filling , no biggie . I will also build this kit on the hobbyboss so that you can see the different aspects of this kit .Please note that I have now added e few more parts to this conversion it at no extra cost to the buyer  , I have added a new aunderwing air/oil filter and ramp , filters  , I hope to add a vacuform front canopy for modellers using the revel MKII kit as the canopy in the kit is wrong for a MKXII spitfire . this will be a few weeks before ready .Please be aware that the revel kit needs to have the cockpit/fuselage aperture adjusted suitably. PS I have now include the main wheels and tail wheel and tailwheel cover assembly .