In classic Aurora I always saved big on maintenance costs by storing garrison fleets and also my main big ships in planetary hangars when not using them, since there was no maintenance costs for military hangars on ground installations.
Since I seem to always struggle with building up enough maintenance capacity and supplies in C# now, I finally came around to testing today whether this could still be a viable strategy if I replaced those ground-hangars with orbital stations. ...After all, in VB Aurora, carriers were super efficient with maintenance by themselves already ('cause hangars don't break), so there might be saving in having expensive ships stored in other, cheaper "ships".
Using this as a station:
Philadelphia DY class Dockyard 500,000 tons 6,028 Crew 50,337.5 BP TCS 10,000 TH 0 EM 0
1 km/s Armour 3-561 Shields 0-0 HTK 2302 Sensors 8/8/0/0 DCR 185 PPV 0
Maint Life 1.08 Years MSP 11,640 AFR 10811% IFR 150.1% 1YR 10,120 5YR 151,806 Max Repair 250 MSP
Hangar Deck Capacity 420,000 tons Magazine 1,600
Lieutenant Commander Control Rating 1 BRG
Intended Deployment Time: 3 months Flight Crew Berths 8,400 Morale Check Required
Fuel Capacity 15,272,000 Litres Range N/A
Pleiades Program Gradar r.24m-res6.5k-1 (1) GPS 1560 Range 24.3m km Resolution 130
Pleiades Program Navigation Sensor r.430k/4.7m-1 (1) GPS 12 Range 4.8m km MCR 430.9k km Resolution 1
Civil Aviation Computer EM8-1 (1) Sensitivity 8 Detect Sig Strength 1000: 22.4m km
Civil Webb Spectroscope TH8-1 (1) Sensitivity 8 Detect Sig Strength 1000: 22.4m km
And 8 of those as parasites:
Kodiak EW class Destroyer 40,000 tons 967 Crew 4,732.1 BP TCS 800 TH 1,920 EM 450
2400 km/s Armour 6-104 Shields 15-300 HTK 252 Sensors 32/32/0/0 DCR 25 PPV 208.96
Maint Life 2.06 Years MSP 1,848 AFR 512% IFR 7.1% 1YR 581 5YR 8,711 Max Repair 240 MSP
Magazine 2,000
Commander Control Rating 3 BRG AUX ENG
Intended Deployment Time: 12 months Morale Check Required
EP480 Kodiak P2 Ion Thruster (4) Power 1920 Fuel Use 28.58% Signature 480 Explosion 10%
Fuel Capacity 1,961,000 Litres Range 30.9 billion km (148 days at full power)
Magnetic Burst Shield (s15-300r-500t) (1) Recharge Time 300 seconds (0.1 per second)
Twin Flak Cannon Turret (6x-20k) (3x6) Range 20,000km TS: 12000 km/s Power 0-0 RM 20,000 km ROF 5
Bridge Tactical Control r.192k-12kps (1) Max Range: 192,000 km TS: 12,000 km/s 95 90 84 79 74 69 64 58 53 48
600mm Barrel Repetier (4/0.4-600r) (100) Missile Size: 4 Rate of Fire 600
600mm Kodiak Artillery Cannon r.158m-res6.5k-400t (2) Range 158.4m km Resolution 130
600mm "Hvy Thumper" Cannon Shell (500) Speed: 9,600 km/s End: 273.9m Range: 157.8m km WH: 4 Size: 4 TH: 44/26/13
Two-Point LR Gradar System r.151m-res16k-16 (1) GPS 61440 Range 151.2m km Resolution 320
Kodiak Project Perimeter Net r.1.4m/15.6m-8 (1) GPS 96 Range 15.6m km MCR 1.4m km Resolution 1
TH32-4 Destroyer Telescope Sights (1) Sensitivity 32 Detect Sig Strength 1000: 44.7m km
EM32-4 Destroyer Intelligence Suite (1) Sensitivity 32 Detect Sig Strength 1000: 44.7m km
ECCM-1 (2) ECM 10
There are also some strikecraft around, which cost maintenance, but I should now be able to see whether this works by looking at differences in MSP consumption. The numbers came out as this:
1) Dockyard and 8 Destroyers around Earth: very exactly 400MSP per 5day
2) Dockyard around Earth, 8 Destroyers docked on it: 270MSP per 5day (yay, so docking does confirmed save costs of things inside)
however:
3) Dockyard somewhere else, 8 Destroyers around Earth: 220MSP per 5day
...So the dockyard costs 180MSP per 5day, while the destroyers cost 130. I could store 2.5 more, but even then I would at best save 170MSP, so still a negative.
The overhauls and repairs are free in this thing of course, which is nice, but sadly it doesn't seem to alleviate the huge investment.(large shipyard+build costs+extra MSP upkeep+80kt more tonnage to maintain)
Maybe it would fare better with only high consuming parasites, but that was not what I came to test. I wanted a fleet harbor, but it seems not even plausible with these relatively high cost/maintenance 0-1 system range defender ships.
The cause for that might be of course that hangar decks now seem to have significant maintenance upkeep. Other than 2 magazines and 4 size-1 sensors, there is after all nothing else on these dockyards, yet even 185 engineering sections give it barely 1 year expected lifetime.
All is not lost however. The magazines are a flaw, and if I have learned anything in VB Aurora, then that the moon is made of cheese, so next I will test this:
1 Strip the expensive magazine components, so that max-repair comes down to 16MSP.
2 Then the Dockyard will sit at the moon without support, so it will deteriorate.
3 Since there can't be more components breaking than 1 at once, there will never be a higher MSP order than 16 per 5days.
4 Whatever the life clock says is irrelevant at that point. If it still says 1 year, good sir, I must correct you, for 11640MSP/16 = 727 '5days', also known under his snazzy artist's name '10years'.
5 Hangars still operate normally, thus 400k fleet support + repair and overhaul for the low low price of ~20MSP a week.

Well, I will test it. I confirmed this worked in VB Aurora, because my Star Swarm/Caravan race game was built on this strategy where the huge 10mt mothership could last 70 or perhaps over 100 years without refill or something. It all depended on whether saving MSP through docking was possible at all. I already confirmed it wasn't working using civil hangars, so my morale was low. ..But since savings appear for military hangars now, chances are high this goes through after all.
Let's see if there is a god out there that will stop me.
