Some have, historically, but it seems to be a bug. Elf Bane currently extends oils, for example, which is listed as an issue that will be fixed next patch.
If sets affecting siege is a bug, as the patch notes for Elf Bane suggest, then it would be breaking forum rules to discuss how to exploit it. It may also be the case that more sets than just Elf Bane are getting fixed, so there is no guarantee that what works now will continue to work when U39 goes live.
as far as im aware your own stats do not affect siege dmg
as noted they are fixing elf bane to not affect siege anymore
the only things im aware of which can happen from siege would be occult overload cp (since siege can proc status effects), and vicious death (procs when you kill a player, regardless of the dmg source you used to kill said player)
i have my main house (grand topal hideaway) listed in the housing tours, it has multiple target dummies, scribing altar, and grandmaster stations (in progress being filled out), as well as almost every antiquity furnishing on display to preview them