I have the 1987 Magician Ex that I bought new in the Blue/White combo. There was a gray/pink one like you built in the store that day. Overall, a great bike. I did crack the seat stay eventually, but aside from that the frame and fork lasted through years of abuse. You did some nice upgrades from stock - the Dia Compe brakes are way better than the Lee Chi originals.
I love the look of that frame. I had a lower end green Kuwahara when I was in 5th or 6th grade. I loved it. My favorite bike I ever owned. I was heart broken when it got stolen. I was not smart and had a cheap bike lock. Cool ride. Nice job.