I'd limit the number of external devices to SIZ, the old hard-point (?) in Traveller.
POW gives the recharge capacity of generators etc, but I'd allow batteries to store PPs (Power Points). Guns, Shields, Warp/Jump Engines, teleport devices, life support etc would all use PPs. This means that your tactics are determined in part by the amount of power you had available. So, perhaps, each gun would use a number of PPs, depending on its damage, basic ship functions might use a set number of points per hour, shields could run at 1/hour or Shield rating / 10 per hour, or something similar. You could even say that some types of shield use extra PPs to absorb big hits. Movement would take PPs depending on the SIZ of the ship, INterstellar travel would be similar, but depending on the mode of travel might be single jumps, costs per hour or whatever.
Ships would have skill bonuses, as specified, but also semi-intelligent ships would have skills of their own. So, a ship might have Blaster 50% and be able to engage in combat itself, but a Weapons Officer might have Blaster 75% and take control in combat situations.
You'd probably need some guidelines on SIZ to show what SIZ certain types of ships would have. Off the top of my head, and completely arbitrarily:
Escape POD: SIZ 1
1-man Fighter: SIZ 10
2-man Fighter: SIZ 15
Shuttlecraft/Runabout: SIZ 25
Small Merchantship: SIZ 40
Small Cruiser: SIZ 50
Medium Cruiser: SIZ 70
Large Cruiser: SIZ 100
Battlestar: SIZ 200
Death Star: SIZ 300
That way, you could design your ship and refer to the standard templates for comparison.
STR - Use this for propulsion, by all means, but this would probably be normal propulsion, not Warp Speed/Hyperspeed/Jump/Interstellar-Drive.
I know this is BRP not RQ, but there are good rules for ship design in the Mongoose books, Pirates has a couple of good ideas.
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