I would recommend having a product offering (didn't see this in the web store) of having the crawlbox without input gears.
The idea being that some people would be upgrading existing transfercase to 4.7 gears at same time.
They could then take the existing 2.28 gears from their transfer and install into the new crawlbox.
The customer can then get all the parts they don't have from you, rather than search for a transfer case and buying your dual case kit.
(no real hurry, as I'm currently just about broke and can't afford any new toys
)