Combine a pair of IRD aero 30mm rims with the rear track hub of your choice (preferably 24-28h) and any reasonably lightweight front road hub (20-24h), with a bolt-on skewer for the front hub. Use decent butted or butted and bladed spokes with aluminum nips in front and brass in the rear. Radially lace the front, 2x in the rear.

You will easily be able to get it under 1600 grams for less than the cost of ellipses, probably closer to 1500 gms. You could shave off an additional 140 gms with IRD cadence rims, but you'll have less aero wheels.

My own wheels are built with Niobium 30 rims, formula rear track hub (28h), formula front road hub (RB-68) (24h) with Sapim CX Ray spokes. The build came out to 1550gms, cost about $335 and turned out to be a very nice, stiff, responsive wheelset, much better than any complete wheelset I could buy for the same price.
Good luck!