"... a modular application..."

Getting off topic, but I'd happily pay for an add-on FBX importer that reliably handles 'open source' rigged figures such as those from Blender.

And, yes, the variant 'Make Human' FBX format, which would seem a neat way to get 'NPC' figures that are neither 'legacy' M4/V4 nor premium Hi-Poly LF/LH...

Sadly, 'open source' FBX rigging does not yet fully conform to Autodesk format, as met in eg 'Rigged in Maya', so results range from 'mildly posable with care' through 'flock of sub-rigs' to 'splat'...

Snag is reliably importing 'open source' FBX rigs opens the flood-gates to SFM, XPS, PMX etc etc.

Potential DRM and licensing issues abound...