Jedi Outcast has Radiant for level editing, Modview for viewing in-game models & characters, and 3D Studio Max exporters for modelling, assimilate for skeletons etc etc. All supplied by Raven.
There's no-way that you can expect people to actually build edting tools for Indy from scratch.
If this is going to go anywhere, you will require tools and technical assistance from The Collective.
Otherwise you're better off making an Indy mod for Jedi Outcast or some other engine that has good support.