If I may recap, the area of Faction Warfare is mostly small gang PVP, so Doctrines aren't really either neccessary or useful. FW people are split into two types: the ancient veterans like Sasawong, who have as many SPs as Methuselah and can fly anything and likely afford anything; then there are the noobs who are poorer, lower in wet skills (ie; experience) as well as hard skills (ie; SP's), and unable to fly everything. An example of this is a fair few of my current Alliance, who haven't been PVPing solid for 3 years and don't have +90M SPs and the ability to fly every subcap aside from industrials.
Doctrines or Concepts therefore need to be somewhat less restricive than some of the popular ones. They also don't need to work only for 20+ guys like Drakeblob does (I mean, seriously, +20 fleets in FW are rare). However, with the looming introduction of cheap logi cruisers and cheap logi frigates, there's definitely going to be lots of actual small gangs rolling with 1-3+ of these ships, so it is time to discuss a tried and true Sudden Buggery specialty: Remote Rep (Assault) Frigates. I'll call it the Cheapcat Concept.
Cheapcat is based on, firstly, relatively defensive combat. Frigate RR even with the new logi frigates requires more control over the engagement than you would need for Hellcats, RR BS or any other RR (as I discuss on the logi frigate thread). This is because frigates are fragile so going up against a relatively equal group of frigates - kitchen sink or otherwise- you will likely lose people due to buffer overruns even with logi frigs on the field.
The typical shield Cheapcat gang would consist of;
X Merlins fit with MSE, AB, Web, Dissy and Rails, rigged for resists and buffer
X/2 Logi frigates, Preferably Bantams, fit with buffer/resist/AB and ECCM
X/2 EW frigates, either Griffins, Crucifiers or Maulus
Armour Cheapcat gangs would consist of;
X Punishers with MWD, Dissy, Web and 400mm plate with pulses with Scorch
X/2 Navitas with MWD and ECCM
X/2 Cruicifiers or Maulus
The key difference is that the shield frigs really will need AB sig tanking, whereas the tougher armour frigates will be able to shed a bit of shield but really will need the maneuverability to get within range and stop enemy frigs from ganking the logi frigates. The key is also going to be webbing down the enemy frigates to prevent them closing with the logi frigates which will be at less than 24km.
Done right, and in FW plexes, I think that these gang setups with the right ratios will do quite OK. Offensively, it won't be so easy unless you get the drop on an enemy.