Due to the increasing size of the Chapter and the scale you are operating at, I'm changing the mechanics to focus less on characters and more on units to keep gameplay sustainable. Working on this and nailing down the basics is why it took me so long to close the last vote.
First of which is that more basic missions will be condensed into Fronts, which is basically a region of space that you will assign companies and fleets to operate in. There will still be Missions, but they will be limited to advanced stuff or specific jobs or important things.
Secondly, I'm not going to be tracking basic wargear anymore. I'll still track the construction of vehicles and advanced wargear like Terminator Armour or Iron Halos. For more basic stuff, due to how many spares and how much new production you have, I'll be simplifying things to just Wargear rather than tracking every item individually. The nature of Wargear and how it works ties into the third change.
The third change is that I'm going to be reworking the Company system so rather than tracking individual squads and wargear, each Company will have a template that it follows and I'll track how much Manpower and Wargear it has by percentage. Specialists, vehicles and advanced wargear will still be tracked separately however.
Anyway, 10 Squads of 10 Marines would be 100% Manpower and 12 Squads of 10 Marines would be 120% Manpower, the latter of which is the maximum. Unlike Manpower, Wargear can go as high as 150% to represent spare supplies aboard the strike cruiser. Wargear needs to be a higher percentage than Manpower otherwise you will suffer penalties. For each template, 1% of Wargear will have a PP cost.
The fourth change is to the Storm Guard. Similarly to with Companies, I won't be tracking individual regiments anymore and will instead be using templates. Each Storm Legion will have a template with only one available by default and it will have a Strength percentage that tracks how much manpower and supplies it has remaining. 1% of Strength will cost a certain amount of RP to replace that is listed on the template and new Storm Guard Legions will be raised as a legion using a template rather than individual regiments.
I also won't be tracking the deployments of the Iron Sentinels and Knights of Caliban anymore. It was one thing to do it when you all had single digit numbers of companies and less than a thousand marines each, but with the current sizes involved, it is no longer practical to do.
There will also be a unique Storm Guard template called the Storm Guard Garrison, representing the regiments stationed at home. Rather than be tracked by individual planets and regiments, the Storm Guard Garrison will be assigned to the Gard Sub-Sector. Its starting template will be equal to the regiments you had garrisoned at the time and due to your training sites, it will passively regain any missing Strength.