The Tornado Looks like it's holding a gun to me. O_o http://www.sarna.net/wiki/Tornado
That's because it's one of the suits that dose use "infantry" weapons as standard weapons, which I mentioned earlier.
Most B-tech power armor have built in weapons rather than the "hand held weapons approach".
Suits that use hand held weapons as their main weapons
Kage
Kobold
Nighthawk 21
Tornado
Gray Death Light
Smoothdavid II (a police suit)
Note: The Kage and Kobold also have a squad support weapon (a crew served weapon if you will). Also their all PAL and light class. Your typical "trooper" suit are mediums.
Elementals, IS Standards (and it's spin offs), Achileus, Infiltrator Mk. II's, Longinus, Kanazuchi's, Hauberk's, Nephilim's, Gnome's and so on all use built in weapons.
Your drawing fits into the typical light and PAL suits.