I played through this over the course of a week, in conjunction with Brutal Doom 1.9 (load brutal19.pk3 BEFORE crusades.wad) on Zandronum OpenGL with textures upscaled to HQ4X. I think that made this 15-year old mod look its best. I liked the new sound for the pistol/rifle, didn't notice the others (prolly 'cause of Brutal).
There are some very tough challenges (played on default skill 3) and health seemed very sparse in some areas, so save often! - MN