Very old (100+y) front door is warped - top corner on lock side is about 12mm away from frame, letting in draught and noise. I don't want to replace the door, so I'm thinking of building up the frame enough to use weatherstrip. What would be a long lasting way to do this? I thought about building a shim out of multiple layers of veneer - it needs to be about 10mm gradually thinning to nothing over about 1m. I could pin and glue it, then use wood filler to smooth over. Alternatively I could 3d print a shim in sections, but I'm not sure the material would be that strong.