Dave,
If by "create the Amiga Native interface", you mean make ReAction GUI`s for the various parts, then I could do the bulk of that work.
Or are you after a native interface that works across all the different flavours of Amigas?
Well once Henning and co do the sane port, we will need a native GUI for that, as from what little I can remember of using OO.org and scanning it currently (in the Unix flavours) calls the Xsane interface, obviously once Sane is ported we will then need an Xsane interface (be it a port or a new Reaction based GUI) for people to select their scanning options.
So there is at least one fully native bit of GUI work to be done, even if OO.org uses its own system with the widgets as discussed by Thomas.
Regards
Mark