Nitromors hints and tips

i considering doing this aswell, but likewise i'm worried about the edges.
i think wrapping a thin band of tape where the edges meet might work, but i'm not sure how good that would look..

So you bought the cups, then what? I have a Carlton; the bottom bracket seems OK (haven't been in to check) but would like a new crankset and work out the best axle length for chainline.