To get a CT for an assault bot you can do 1 of 2 things:

Buy an assault bot on the market and RE it.  Or, you can learn how to make a prototype and build that and RE it.

Assault bot protos take a lot of NIC, titanium, and some other basic mats as well as damaged fragments.

Thank you for the post! Where can I learn how to make a prototype? I thought I had to collect kernels from an assault bot, is that true?

I don't know.... Ive had people tell me the rookies/1st stars/servants will give you bot research. I have personally researched hundreds of kernels to no avail. Well the exception being 100% on Termis and Gargoyle, but not even 1% of any other bots.

Ah, no. Let me try to elaborate on this a little more extensively.

NPC difficulty is determined in tiers (1 through 5) and each tier has unique names for their faction. Nuimqol drone tiers are named 1st star (weakest) through 5th star (strongest), Thelodica tiers are named Rookie, Warrior, Veteran, Elite and Supreme. Pelistal tiers are Servant, Patrician, Arbiter, Hero and Overlord. Industrial tiers are Copper, Iron, Bronze, Silver and Golden.

When researching kernels, it is partially random on what items/robots you obtain knowledge of. You will most probably start obtaining robot knowledge from Nian Trust robots (Argano, Laird, Sequer, Termis, Gargoyle, Riveler and Symbiont) that are primarily found in Syndicate kernels (named only "Drone Kernel"). After that, research any Nuimqol kernels and you might obtain knowledge of their bots in the order Yagel, Cameleon, Arbalest, Kain, Vagabond, Mesmer (I think). In addition to that, you learn their faction related items, Nuimqol kernels train, among other items, magnetic weapons, accumulator rechargers and accumulators for example, but no laser weapons or missile launchers.

Light and assault kernels also only contain knowledge about small modules, while mech and heavy mech kernels will teach you medium sized modules, unless it was changed.

Items are also tiered, with tier 1 always being the standard version of an item (e.g. Standard small armor repairer), while tier 2 through 4 have unique names. After the latest change, 1st star kernels will only train you standard items, 2nd star kernels will contain knowledge about tier 2 items, 4th star has tier 4 knowledge, while 5th star have knowledge about all tiers. See patch notes, Industry: http://www.perpetuum-online.com/Changelog:2010-10-29

After researching you can then finally create a prototype in a Prototype Facility on any terminal. Tier 2 through 4 items have unique "prototype" versions which are often lighter than the regular tier 2 through 4 versions and have lower fitting requirements, sometimes perform even better, too.

Standard items do not have this special prototype version.

To make this post complete, you can then put a standard item (Tier 1 item) into a Reverse Engineering facility along with a Decoder (random drop from NPC higher than "Drone" or "Thelodica/Nuimqol/Pelistal Drone") and use the resulting Calibration Template (CT) in the factory.

To make a CT from a tier 2, 3 or 4 item you need the aforementioned prototype version of the item, a regular tier 2, 3 or 4 item can not be reverse engineered. It's sort of a protection and reward for players who put effort into acquiring kernels for research.

I hope this cleared things up a little bit more. Feel free to point out any errors

I ate near 100 T3 thelodica kernels (light and assault) and i just get some "named" stuff
I ate some T1 thelodica mech kernels and i got standard medium stuff

Do you need to know at 100% all Nian Trust robots before having a chance to get faction spécific robots ?

Did you get or have any Industrial bots unlocked, because it could be that you need to get them first (not sure at all about this)? I had all the industrial bots and had burned around or at least 300 T1/T2 kernels from each faction before I started to consume those T3 kernels. At least with Thelodical, I had to consume 50-100 T3's (assault and light) before I got any knowledge to Prometheus.

It could very well be that you can research lower tier items faster with higher tier kernels. I should say that I don't have any proof or experience that supports my assumption.

Oh, sometimes you want to research only 5 or 10 kernels at once instead of 100 at once, right-click on a stack of items and select unstack, you can make 20 stacks of 5 with just a few clicks.

20 chances to get knowledge for a specific item/robot instead of just 1 chance due to the bit of randomness =)