![Mr. Green :mrgreen:](./images/smilies/icon_mrgreen.gif)
This is a completely new monster (pun intended), and would certainly require maps to be edited into new ones and tested.
Like I mentioned, quality over quantity, and converting a few of the existing good maps wouldn't be very hard, it would be just harder to get permission for each one, unless their ReadMe already allows for such to happen.
And do not forget that newer games only have about half a dozen maps at most, but good maps with a lot of work put into them, and in UT99, despite the best efforts for admins to have hundreds of maps, in practice only about a dozen actually gets played, and are always the same ones and even variations of the same one.
Furthermore, you cannot expect mappers to join in immediately, something must be created first and it must work well, without issues, and it must be really fun and be very immersive, in other words, we need to set the example first.
However, this is indeed still quite an undertaking, and it's not trivial and it's not something to be expected to be finished by the end of a single week.
As for Survival, I only remember a bit about it, and I remember it made an attempt to have levels and experience and that kind of stuff... but yeah, it didn't pull me in, and I play things like Invasion in UT2004 times to times, as well as Killing Floor 2, No More Room in Hell, among one or other thing, so I am into wave-based survival games myself.
If I remember it correctly, I think it missed some really critical stuff, things the other games had, not exactly in terms of features, but more towards the atmosphere of the whole thing, it felt a bit like playing with cardboard... if you understand what I mean.
This is just my opinion for what it is worth (as always), but I think in PvE games and gametypes, atmosphere is the most important thing, closely followed by progression kind of system and the weapons themselves, and both must work very well and be very smooth for the player, with the right balance.
Because at the end of the day, PvE can simply be resumed to just be playing against "bots", which by itself is not as exciting as PvP, so there must be other elements of interest, and this is also why in BT mappers take the time to do beautiful and interesting maps.