Since Dev created this thread and accepting suggestions, I'd like to leave some "ideas"/suggestions:
Easy things:

"The Crucible"-Aw yea, the Doom Slayer's energy sord, unbreakeable or not, it should be powerful, i think.

Medium difficult things:

Praetorian suit(DOOM 2016)-I personally like this bad boy more than naked arms, pure IMHO.

UAC Pistol(DOOM 2016)-Why not??? Inf. ammo??? Alternative firing mode? i think it's best to be just a powerful pistol, too complicated shet for 1 gun.

Supershotgun-Same as pistol, unique powerful gun, i have nothing to add.

Other weapons-well...I don't think they need to be, plasma, gauss and especially BFG. Nope.

The hard(est) things:
Some additions to Slayer proffiency, like killed undeads contain argent energy for ammo craft/etc, unneccessary stuff?

That's all

Having the Heavy Assault Rifle from either Doom 2016 or Doom Eternal would be amazing to slaughter the hordes of the damned with.

Would be possible to create a sub-mod that, instead of including a profession and unlocking the armor from the get go, it spawns the armor in a secret location like a military base, so we need to find, maybe repair and then use it?

I believe it would be a nice side objective to have in-game and it would make the armor more precious and somewhat a late-game reward.

The suit from the OG 1993 Doom would be cool. What would be even cooler though, is a sandbox setting to turn off the Slayer profession for those of us that just want it to exist as an easter egg in our game world, rather than play as the Doom Slayer. Also an option to change spawn chance specifically for the suit would be great.

I want some advancement(or change) about the Slayer's Helmet: whenever metalworking, the Helmet is unequiped(cuz of a welding mask equiped). Is it possible to add the option of welding mask to the Helmet?

ps. well, I also think that's not cool for the Slayer. XD

An option to disable the profession. To let only the armor ingame.

my suggestion isnt for the mod itself but more of a request.

please make an HEV Suit from half life with really good stats

Where do you find it? Where do you get it?

OG doomguy armor