Here is a fun, mixed/high damage/survivability, antiproton based, F2P build for players owning the Command KDF Battlecruiser Bundle for Advanced difficulty content.

Antiproton DHCs can be had as mission rewards from Blood of the Ancients.

Until you can progress the Discovery and Competitive rep's tiers for the deflector, engine, and shield, just use the Quantum Phase set from mission Sunrise.

Subspace Field Modulator comes from mission Skirmish. Energy Amplifiers can be crafted at Beam R&D level 10. For Deuterium Surplus first get to level 65, pick up Galaxy at Large from Available tab, then pick up Spectres from the Available tab, then Skirmish from the Available tab, and then you can go to Alhena system to unlock the reward, which can then be crafted in Eng R&D. Reactive Armor Catalysts come from mission Broken Circle and can then be crafted in Eng R&D.

Trellium-D armor comes from mission Ragnarok. House Martok console from House Pegh. Zero Point Energy Conduit from tier 1 Romulan rep. Assimilated module from tier 1 Omega rep. Crystalline Absorption Matrix is very rare reward from Phoenix. Voth Phase Decoy is ultra rare reward from Phoenix. Lorca's Custom Fire Controls from tier 5 Discovery rep.

Personal traits are all standard except for Point Blank Shot which is from House Pegh.

For starship traits, Unconventional Tactics is from 15 points spent in Strategist spec. Improved Brace for impact is from the An'quat War Command Battlecruiser from the same bundle. All Hands on Deck is from the Ty'gokor. Improved Command Frequency is form 30 points spent in Command spec.

Rep traits: Advanced Targeting Systems (Dyson), Magnified Firepower (Gamma), Precision (Romulan), Tyler's Duality (Discovery)

For the boff layout, Reverse Shield Polarity 3 can be replaced with Suppression Barrage 3. These abilities do roughly the same thing as they reduce incoming fire damage. RSP3 only works for you whereas SB3 will help teammates as well. Nausicaan boffs with the Pirate trait are fairly easy to come by as a KDF toon.

Ability cooldown is handled by dual Auxiliary to Battery 1s doffed with 3 rare or very rare Technician doffs which can be had for critting (VR reward) the B'tran Cluster's "Support Colonization Efforts" assignment which is repeatable, after completing the colonial assignment chain . Can also get one from tier 4 engineering doff commendation. They are available on the exchange as well (can use cheap uncommons or rares from the exchange first). The Emergency Conn Hologram is a very rare reward from Phoenix. The Projectile Weapon Officer is Law from mission Fist Full of Gorn.