That doesn’t factor in the chance for a Triumph, which reduces the number of Advantage you need dramatically. Additionally, if you have Safety Features on your Specialist Tool, then you’re adding +1 Advantage for “free.” So if you roll a Triumph, you only need a net 3 Advantage. Add in a couple ranks of Eye for Detail, and your odds improve as you can adopt additional net success.
I think the Combat Directives is fine as-is. When you look at Rival-level combat droids, they generally don’t have all that many ranks or skills.
For the chassis, I’d drop Intellect. I’d suggest dropping Cunning as well, but I think you can get away with it. My main concern there is just that Cunning is a rare stat for combat droids, so when it shows up (Sniper Droideka, BX-series Commando Droid) it could be seen as a case of Superior Hardware.
I think that 321111 is probably the best bet. Increase Soak to 5 and WT to 13. Soak and WT is based off Brawn. When compared to the Specialist Chassis, WT-Brawn=10, so 10+Brawn=WT. Likewise, Soak-Brawn=2, so 2+Brawn=Soak.
With 3 Brawn, you come up with Soak 5 and WT 13. If you were to add in “a rank of Toughened” as is common for many combat-focused Rivals, then that would put it to 5 Soak, 15 WT. I’m not against that at all, I think it might be good.
Keep it at Daunting, but I’d increase it to 5 days (120 hours). That means that Basic to Intermediate is +3 to 5, and then Intermediate to Advanced is +5 to 10. I like that sequence, the numbers “rhyme” if you will, moving in a nice curve. Similar to Fibonacci numbers, though the sequence isn’t quite the same. But I digress. ^_^
As for the cost, best option is to compare to what’s on the market. (Editor’s note: and then I got sidetracked. Bear with me.) Closest comparison is the Security Droid, which is really just a basic Combat Chassis with +1 Cunning (so it has decent Perception). Its skills are Ranged (Light) 3 and Vigilance, and it’s got a Soak of 5 (2+Br+Armor Plating) and a WT of 14 (10+Br+Reinforced Chassisx10).
The only one that doesn’t line up is the Reinforced Chassisx10, and that could be remedied by my earlier explanation of how this would be chalked up to the R&D that goes into the official droids, something the PC doesn’t have the time, crew, or possibly even the inclination to do.
To replicate the droid, one could simply make a Rival-level Directive (“Sentry Directives”) that gives 2 ranks in a Combat skill, 2 ranks in Vigilance, and automatically makes the droid a Rival if it wasn’t already.
Oh, right, price. It’s priced at 9,600.
If you compare the other closest comparisons, the Specialist Chassis is 56% the cost of the Protocol Droid or 54% the cost of the R2 Astromech, the Advanced Combat Chassis is 49% the cost of the Assassin Droid, and the Combat Chassis is 50% the cost of the Antiquated Battle Droid.
However, the Security Droid isn’t much of a jump in price. Therefore, I’d say that it doesn’t give us a great comparison since it seems to just be a very well-done Combat Chassis, hence the ~50% mark-up from 6,500 to 9,600.
My conclusion: We don’t really need a new chassis, just good rolls. What we do need is a new directive, “Sentry Directives.” Give it 2 ranks in a combat skill and 2 ranks in Vigilance. If the chassis is not already a Rival or Nemesis, it becomes a Rival.
At a base with no Advantage or Triumph spent, you get a Rival-level droid with the following stats:
221111, 4 Soak, 4 WT, 0/0 Melee/Ranged Defense.
Skills: Ranged (Light)* 2 (YY), Vigilance 2 (YG).
Talents: [Maybe add one]
Abilities: Droid
On building, a Triumph and 3 Advantage could give it +1 Cunning and +1 Soak or +3 WT (the latter is better, in this case).
On programming, a Triumph and 2 Advantage or 4 Advantage can easily get it to 3 in both skills. For good measure, you could even add Perception to its skills if you wanted to.
*Doesn’t have to be Ranged (Light), but that’s what the Security Droid had.
But I think this represents what we see well, without really needing a new chassis or trying to wrangle a new price.
Looking through CotR and RotS, the only Rival-level droids are exotics like the LM-432 Crab Droid, Droideka, DSD-1 Dwarf Spider Droid, Octuptarra, etc. The only exceptions to this are the C-8 Saboteur and the Supervisor Droid. The latter is basically a Combat Chassis with a species Directive that would make it a Rival, the former is utterly different from anything we could currently craft, and should be treated as an outlier.