Nice bike, roccobike. I always liked the Nishikis with the faux Nervex lugs because Nervex were the top lightweight lug when I first got into cycling. Nothing wrong with upgrading to alloy rims, although I would have gone to Presta valves instead of those car-type Schraeder valves. I'd also replace that mattress roadster saddle with anything more appropriate and get rid of the safety levers and pie-plate spoke guard.