There are talents which give it, too, such as:
Damage Reduction 10 (Force User) -- Can spend Force Point as standard action to gain DR10 for 1 minute (
SWSE)
Soft to Solid Matukai As reaction to attack, can spend Force Point to gain DR10 (
JATM)
There are feats which allow tech to be modified to give it. These are a few off the top of my head:
Superior Tech (
S&V) and
Biotech Specialist feat also allows it. (LCG)
This is not an exhaustive list.
If you are wondering how to give it to a droid -
Superior Tech is the easy explanation.
The design rules in SGtD suggests that DR as an intrinsic element of a design (not just a Superior Tech bonus of +2 DR) ought to be restricted to
at least Gargantuan and probably only
Collosal Droids. Droids in SW are for the most part,
relatively fragile electronic systems. If you want to put them behind 10" think Duranium Alloy exoskeletons (like a starship) DR 10 might be possible. For the most part, the sheer weight of that armor makes it impractical to add it to a droid. When that sort of protection is needed, it's more cost-effective in terms of protection/weight to do it via shields, not with incredibly dense armor.
Better still, just put the armor on a vehicle and DRIVE IT with a biological pilot and add gunners that don't need all those heuristic processors.
Note: DR shows up most often in heavy vehicles and starships. That's where it enters the game as a construction element, rendering many heavy armored vehicles and all capital ships essentially immune to small arms fire - even with their shields down (as they should be).
As for hit points....yes, droids are not as tough as a biological, level for level. But it's really only an issue when you are playing them as a Heroic Droid PC. Please appreciate that biologicals don't get the options of upgrading their equipment or buying Superior Tech to add
significant and major bonuses to their stats. It does not cost
that much, really for dramatic increases to stats and swapping out skills, for that matter, using superior Tech. And then there are Shield Generators and other special gear.
They also heal much faster, through use of their gain points per hour ability with mechanics. The lack of Con is an issue, and it may be that the hit point issue is a little over-emphasized with the lack of con. IF you think SWSE goes too far - give them more starting hits. It's not like Rodney is going to drop by your game and bitch at you about it