The gear isnt Officer Tech 1 its named Tech 1 from Cosmos blueprints, it exists but is ridicously hard to make and not worth the price tag that people often attach to it.
I'd go with this fit (had to type it out as I dont fly Minmatar on Mangala):
High Slots:
6x 720mm arty, 2x assault launcher
Medium Slots:
Medium Shield Booster, Large Shield Extender, and either 2x rat specific hardeners (hard mission) or invuln + AB (easy mission)
Low Slots:
Damage Control Unit, 3x gyro, 2x PDS
Drones:
2x med, 2x light
Doesnt differ much from yours but a medium shield booster will do the job good enough for pretty much most missions up to and including the tougher level 3's.