Thanks, Leo! I will give this a try. Looks like you have covered everything pretty well here, nice details.
I've managed to 'hack' (and save) a few parts (very few) as GRJ & CJ mention above. I got them saved to the .eli files like you have done with your Mouser files, but I haven't gotten the 'Library' (as put them all in one User library) part mastered either? Havent messed with it for a while, but I will definitely have to try your instructions above.