After months with little activity, there is a new list of applications that work with X/Qt and a page about mkpkg in the Wiki on the Japanese language X/Qt page:
X/Qt WikiThere is also a link to a page of packages for Emacsen:
Emacsen packagesThere seem to be some new packages and information, but the translation I get is pretty opaque. Any assistance from those who can read Japanese would be appreciated. A return to active X/Qt development or additions to its package feed would be welcome.