legacy mod is not going to modify gameplay. We may differ in gameplay definition though.
You should've checked the actual hitboxes before writing something like this...
Do these even look like the most realistic hitboxes?
Even Jaymod has an option to set smaller ones (sic!):
1. etmain is not the engine but the mod (cgame/qagame).
2. The engine is called id Tech 3.
3. It is not a remake in a definition from the first post: