For almost every replacement you see in that vid, I had at least one variant of it planned. Have a lot of guns lined up so far (pic attached), each with relevant OF/BS hands and different animations for classic mode when needed. Also, the HEV doesn't have glowy bits like the ones currently being implemented officially. That alone is gonna be a slow process.
For those who want proper stats, so far I have planned:
20 9mmARs
8 9mmHandguns
8 357s
2 crowbars... probably more later
6 DEagles
11 M16s
5 M40A1s
5 SAWs
8 Shotguns
2 Spore launchers
8 Uzis
2 Crossbows
Some of the 9mmARs might be ready for HL soon as standalone.