I think the Haven might be lacking some things.
First, 2/3 is really slow - I'd want at least 3/5 if you ever want it to get anywhere.
It cruises at just under 12 knots, and flank speed is just over 17 knots. That's not awful, and most hospital ships aren't blazingly fast, and the extra mass to go faster would have had to come from somewhere it could better use.
Second, are 2 laser AMS really sensible? laser AMS are a lot heavier than regular AMS but don't require ammo, I feel 2 AMS and 1T of ammo would be better in all but extreme edge cases and save you 1T.
Would have saved me more than that with heat sinks, but also introduce something that could explode.
Third, are there any crew quarters? Not even infantry bays? Where do the crew sleep? Extra infantry bays could be used to house walking wounded, refugees, pre/post op patients etc.
Considered integral to the design of a ship this size. This isn't a Large Naval Vessel, though.
Forth 100T of light vehicles and 100T of support equipment/stores seems off. Personally I'd ditch one vehicle, use that tonnage to add quarters and infantry bays, speed etc.
Uhhh...
It has 10 tons devoted to refrigerated cargo for food and for medical supplies that need to stay refrigerated, looks some vaccines or other drugs do.
It has 35 tons of general cargo for spare parts, dry goods, etc.
It has spots for two 10-ton shipping containers, taking a page from the real life Spearhead class EFT, using them for special mission modules.
It has multiple field kitchens to support relief efforts.
That's...not all that much.
Fifth, the vehicles, I'd be inclined to a single fast vehicle set up as an ambulance/people/cargo carrier rather than a fully contained hospital ward. I'd go for a VTOL with amphibious mod, infantry bay, paramedic equipment and lift hoist - if there are injured it can collect and airlift them back to the hospital ship under care. Or it can ferry supplies out to setup a field hospital. As per 6 below your 20T WIGE doesn't have the space to carry the 20 medical personnel that would work the 4 MASH theatres.
Cool, cool. I mean, it's only, what, around 500-5700 tons too light to even use a VTOL while underway, because helipads require a much larger Large Naval Vessel under the rules, and weigh 500 tons by themselves
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Sixth, 20 Theatres is an extreme amount - these are surgical suites. You need beds (like infantry bays or steerage quarters) for people awaiting surgery and maybe 2 theatres for a vessel this size. Each theatre is serviced by a crew of 5! you do not have beds for 100 additional crew.
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Oh no, at 0.20 ton per officer's quarters, 0.05 ton per enlisted, and 0.02 ton per steerage quarters, whatever will I do?
Probably cut the cargo by 11 tons for the 23 officers and 113 enlisted. The two vehicles add 14 more officers and 68 more enlisted so...round up to 7 more tons, knocking the base cargo to 17 tons.