1. How do I modify an item (YT-2000, Lightsaber, etc.)?
2. If I can't do the modifications myself, which faction must I contract to complete them?
3. Where can I find a list of possible modifications that are available?
1. Items (ships, items, vehicles, etc) are not modifiable at this time (Lightsabers are able to be crafted however, but once must be Force Sensitive first in order to allow that).
2. You can't, no factions can either.
3. You won't, they don't exist.
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"I like Justin Beiber Mash-Up's the best" is what I keep telling myself.
The only modifications that exist at the moment are of external look.
You can change how your item/ship/station/droid/etc. looks like by applying new image to it.
And before you begin to point out that people are offering modded ships for sale/trade, modding of ships was done years ago as various rewards. However it has not been done by the admin for over 3 years now, and they will not do so. You will have to wait for R&D and the expected modding system that will follow it.
Come on Drex, we all know that all those looting and scamming have put us all in the bad books with Father Christmas. We'll all be getting Rock Ivory deposits replacing our Varium ones.