I recently came up similarly short on a wheel build (old Campagnolo Record high-flange hubs, 27"* 36-hole Nisi rims, 4X)-- most embarrassing for someone who has built dozens of wheels and who used to work at a bike shop.
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* My initial reaction was that I ordered spokes for 622mm / 700C rims instead of 27", but I rechecked my work several times. I'll probably cross-lace to a set of 700Cs, perhaps even the bike's original tubular rims, and move on. ...
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069