There are hundreds of weapon mods out here but thess aren't that bad, and I've never seen a briefcase model either (replacing the cane)

The pistol is a silenced Springfield 1911 .45 (pro's choise)

The rifle is the (never largely scale produced) Walther 2000

The knife is just a knife (what did you expect)but on the hunting knife side.

I also made a good HK mp7 model (sadly I was unable to produce decent textures)

For pics visit this topic at Gtaforums: http://www.gtaforums.com/index.php?showtopic=255170