It looks great! Some chrome trim around the portholes might help it look more finished. See:
http://www.ebay.com/itm/1953-6-BUICK...-/111146690117
The Vignale Ferraris, which were clearly the inspiration for that styling aspect of the Miglia, had chrome trim around their portholes. See:
http://www.boldride.com/ride/1952/fe...zzeria-vignale
Also, have you thought about opening up the rears of the front wheel holes, in the style of the 625 TRC Ferraris? It might help balance the design a little. See:
http://www.favcars.com/photos-ferrar...957-134482.htm