Here's a droid I whipped up as a personal bodyguard. As for what it looks like I was thinking about it being modified
Mark III War Droid from KotOR
[sblock=Mark III bodyguard droid]Medium 4th degree droid, nonheroic 6
Init +8; Perception +8
Languages: Basic, Binary
-----------------------------------
Defences: Ref 14, Fort 12, Will 10
hp 21; Treshold 17
Immune droid stats
-----------------------------------
Speed 6 walking
Melee; Force pike +6 (2d8+2)
Ranged; Blaster rifle +4 (3d8) or
Ranged; Blaster rifle +2 (4d8) with rapid shot
Base attack 4
-----------------------------------
str 14, dex 11, -, int 10, wis 11, cha 7
Feats: Armor light, Improved treshold, Rapid shot, Skill Training Init, Toughness, Weapons; rifle; advanced melee.
Skills: Perception 8, Init 8
Systems: Walking, heuristic processor, 2 hands, Durasteel shell.
Possession: Blaster rifle, Force pike[/sblock]
I modified the droid from super battle droid by modifying feats and systems. I calculated it to cost 6950 credits by removing and adding systems and the force-pike, but if you would kindly check this. Since you said some droid components would cost more because of the time-line I think a price of 7000-8000 could be okay?