Yeh that's a pretty large Vas, not too unreasonable though. Depending upon what power you're running, I would say go for a fairly small box. 1.3CuFt fits that bill pretty well.
It's more prefab ported enclosures that you have to be very careful with, sealed tends to be pretty forgiving.
Presumably that enclosure is an off-the-shelf jobbie? If so then it's worth running a bead of gripfill, or similar, around the inside of all of the joints, to seal it up properly.
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