Some personal suggestions, most for balances:
1, add kinetic4/he5/beam6/energy7/fighter8/interceptor9/bomber10 or similar combination to all imperium and chaos weapons and fighters, or the variants functions can't be used in the game.
2, to match the vanilla ships' size, maybe it's better to lower the imperium and chaos ship image size to 1/2 (4x4 -> 2x2) or 2/3 (3x3 -> 2x2).
3, there are so many lance batteries on imperium and chaos ships, for the balance, maybe lance batteries are better to medium-sized long-ranged vanilla phase lance, but not another tachyon lance.
4, since macrocannon batteries are lack of anti-armor ability compared with lance in BFG table game rulebooks, maybe they'd better to have low dph similar as vanilla light needler. Then chaos need medium-size macrocannon for prow and dorsal weapon batteries. Also in table game, for example crusiers have port/stbd weapon batteries as 30cm 6 firepower or 45cm 4firepower, so maybe it's better to have this two different styles of small-size macrocannon.
5, in BFG table game, there are no ships around 80 points as ss vanilla destroyer(<=45 points for escorts, and >=120 points for light cruisers), so maybe we just don't need it. And for 6 firepower port/stbd weapon batteries and 2 strength lance batteries of imperium and chaos ships, always lightcrusiers/crusiers have range as 30cm, battlecrusiers/giant cruisers/heavycrusiers have range as 45cm, and battleships have range as 60cm. So maybe set the hullsize of light crusiers/crusiers as cruiser, battlecrusiers/giant cruisers/heavycrusiers as capital ship, and battleships have advanced targeting core. Maybe this can matches the settings of table game.
6, after the previous changes, maybe ships can need 1/7 or 1/8 points of BFG table game, like battlecruisers need 30~35 points, battleships need 45~50 points, and planetkiller/gloriana need ~100 points (maybe lower flux dissipation for all ships, just a little more than enough for one side's attack).