This alone for me looks ambitious and hard to make. For now, I'd like to know how much I'd have to pay for this.
I know that
https://forums.alliedmods.net/showthread.php?t=327281 and
https://forums.alliedmods.net/showthread.php?p=2631488 exists, but both are abandoned and incomplete, Reverts makes weapons unable to drop and Golden Ages crashes the server for one reason or another.
My request is for a more authentic experience, to make it as closest we can to how it was in between 2011 and the 2012 versions. A total conversion centered at around those years.
So that means:
-No groaning on classes when receiving fall damage.
-Weapon system restored, meaning dropped weapons from dead players are allowed to be pushed by explosions and being used as ammo (meaning not able to switch).
-View and world models restored.
-Old, slower weapon draw speed.
-Old item set bonuses like Scout's "Milkman" with +25 extra max hp (with a total of 150 hp).
"Golden Ages" already does the bonuses, but only for the "Saharan Spy" set, take a look for code reference.
You can probably take "Reverts" and "Golden Ages" .sp's for reference too. Use the Update History from TF2's wiki, but the best also test some versions themselves by downloading old TF2 builds. (I can guide you through that).