This is a request I have for anyone who wishes to take it. I wish for a plugin that allows you to equip weapons that the MVM giants use. If you need a list, take a look here https://wiki.teamfortress.com/wiki/Robots
If this plugin is not possible, please let me know and this post will be deleted. Thank you.
If you want to make a plugin that changes you into an MvM Boss and gives you custom weapons you might try the 'Be The Deflector Heavy' plugin by the talented Pelipoika. I have used code from this plugin to make many of my own bosses. Here's a link: https://forums.alliedmods.net/showthread.php?p=2179796
Here's a video showing some of the Bosses on my server: