If you can't find one (Monogram did a kit in 1/48th, which can still be found here and there), then it should be a fairly simple job to shorten the 'glass' nose, smooth it off with Milliput or similar, and drill the holes for the cannon and guns. Takes a bit of work, but not much and not too difficult. Either that, or make a balsa former and mould a nose from plastic sheet, as Andy suggested (Crimea R.).