Best way of implementing riding mounts (radstags) to F4?

[HoratioCaius]

Could I use basic systems from Skyrim? And what is the easiest way to place custom animations in the CK?

[BlahBlahDEEBlahBlah]

For a rideable (not drivable), could do what I did (not the best way) and start chopping up the Vertibird. At least for a rideable one, as mentioned.
Then add the pertinent parts to another skeleton (in your case, the Radstag skeleton).
Creative usage of race, packages, follower scripts and combat styles.

http://www.nexusmods.com/fallout4/mods/17128/?

 

It's funny, though, anyone who *actually* knows how to do it might not say, because they are most likely working on it themselves.

Hopefully that's not the case because I need to ask eventually a related question myself, concerning fast travel.

Anywho, regardless, it would be a huge project and something not easily taught from a single post, or even thread.

As far as actually drivable/directable? Talk to the Motorcycle people. ;-)
...unless there is already some secret project going on (not unlikely at all).

Custom animations? No idea, but there is a thread around (that I myself need to pour over eventually) here somewhere that has all sorts good info about it, and helpful tools.

Anything from Skyrim is off limits unless you rebuild it from scratch.

 

Edit: I actually do apologize if that seems like a tiny bit of self-promotion I just did, sorry.