How feasible is an all drone army w/ forge world?

I was thinking of trying a Combat Patrol
2 ML towers as troops,
a 6 model TL BC heavy drone squad,
a 2 model BC + ML heavy drone squad,
and two 5 model gun drone squads.

I wouldn't be taking the required FW but maybe people will let it slide. I can't take the required commander anyway 'cause he has too many wounds.

The auspex on the towers will be useless since I have no seekers. With the restrictions on armor in a combat patrol I should be able to flank any vehicle and hurt it w/ S5 weapons.

Anything in other books aside from Taros and basic Tau codex that might help? Is there a 2007 update?