I wouldn't bother trying to fill the cabinets with anything. If you put an Omega 15 into an old Theater four π cabinet, the response curve isn't bad. It's overdamped, curve sort of like an EBS alignment but instead of a shelf you get a smooth flat diagonal line. Not bad, especially indoors where the room gain will boost the low end.That cabinet will give you very deep extension when the Omega 15 is in it, and without any real penalty. The boxes are large, that's about the only down side. But if you're used to that size cabinet anyway, it will sound fine.
Later, when you get around to building the new cabinets, you might also consider adding subs. This will give you even deeper extension and more importantly, will smooth the bass throughout the room. It does this by averaging out the room modes. That's really the premier setup, very nice.
But for now, what you're doing will sound great. Plenty of bass and smooooth midrange and treble. Toe them in like cornerhorns, forward axis crossed just in front of the listening poisition.
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