can you make it symmetrical

Unless it was fixed since it was allowed in etf2l cow mangler won't be realoaded after you get a kill

I don't get the point of that video. To tell the story of the few of many maps that had potential to be great of which only few made it? Nothing has changed in that regard. The promising looking maps are still played and given opportunity to develop and then becoming a staple (sunshine) or dropped if their major problems arent fixed even after number of seasons (reckoner). If there's a promising enough map with a lot of potential it will be given similar treatment to all the maps banny mentioned, even if just for the purpose of getting rid of badlands.
And yes in the past more incomplete/awful maps were introduced but the game has developed and we have more references to make it easy to spot which map has potential and which doesn't and since the game is old and has fewer players there is lower number of map makers leading to fewer new maps.
Another argument that could be made is that in the past valve/early custom maps just sucked for 6v6 and since today we already have many good maps there is less need to adopt half baked might get good type of maps.

use this https://developer.valvesoftware.com/wiki/GCFScape to extract files you want from tf2_misc_dir.vpk and then treat them like any other custom hud file

the crosshairs provided should all be as centred as possible (off by 0.5/1px) but you can try messing with "x" and "y" in the script file

tf_weapon_builder

unban vaccinator = gabe will give us 100000000000 $ major how can you not see that

the games takes any files that are custom and reads them instead of originals, doesn't change any of its files. Therefore if you have no custom files it reads the default ones, which you aren't able to edit (well you are but game shouldn't even launch)
you can try checking game cache
these are unedited converted weapon scripts, try to put them in https://www51.zippyshare.com/v/KWFW5B6o/file.html (cba filtering out those with explosions)

it's knows for a long time and an official issue has been open on github some time ago https://github.com/ValveSoftware/Source-1-Games/issues/2489

edit:

https://i.imgur.com/L1ygotT.png

:(

you probably are not preloading properly
download this map: http://fakkelbrigade.eu/maps/preload_room.bsp
and put this into your autoexec:

map_background preload_room; wait 10; disconnect;clear

either just remove the crosshair parts from your old script or use this http://www.teamfortress.tv/34834/yttriums-competitive-viewmodels

thoroughly check your custom folder for tf_weapon_*.txt/.ctx and remove those
if you are using vtf crosshairs revert the explosion names back to default in respective files

wheres koth_isla

mat_mipmaptextures

degu
czechia
https://www96.zippyshare.com/v/5lWG9X0P/file.html

https://www102.zippyshare.com/v/fvfg8CAP/file.html