Good stuff! Should be awesome for door edges. I actually bought a cheap Chinese puller kit to make something similar. Either as a stand-alone, like what you've made, or as an attachment to my Dent Dial. I've made a few fender edge tips that work great. Posted it on a Facebook group years ago (Han Kim). I'm getting more ideas now, Thanks! And keep on rockin!
Nice work! But refrain from wearing gloves, when drilling! It happens so fast and its not necessary to make the experience to lose your fingers! Take pliers or whatever and take care! Regards from Germany.