load in the obj ....go edit ...select all press / three times to reduce size.
now go edit...colour...colour by gruop
then again edit....select....select by group
u should now have selection for the meshes
select your first mesh ... then drag from selection box up to middle of screen, u can press * on keypad to make bigger / smaller
once it looks good go select...New Umap ....planar( or whatever) u might have to play with all the settings to get each mesh right...
repeat for all other meshes once you have done all the meshes go File...save model... ok the box then save the model like modelmapped.obj so you know its a mapped model,
then file...save texture map
save the map as something that relates to the model
now use the texture mapped file in gimp, photoshop etc ...
overlap each mesh by a couple of pixels otherwise u get white area on outline
reload into anim8or as obj model then usr your texture as material
Hope this helps.
I will try and do a better version ... which u will find later on Animanon