These projects often seem to get bogged down in the costs and practicalities of creating the plastic parts rather than the electronics/software. Large injection-molded enclosures aren’t cheap (for lowing-volume products) and custom keyboards/key caps are even harder to do. (Still waiting on Amiga key caps from a Kickstarter about 4 years ago… apparently it’s still happening eventually…)
That can lead to long delays and high prices.