IttyBittyLivingSpace

This mod for the HBS BattleTech game makes storage aboard the dropships significantly more expensive. Inventory and mech parts kept in storage have a monthly recurring cost that increases exponentially.

Active Mech Upkeep

Mechs currently in a Mechbay during a financial report triggers add to the monthly upkeep as well. Each mech's ChassisDef.DescriptionDef.Cost count as its base cost, which is multiplied an upkeep factor. This factor is defined as UpkeepChassisMulti, which defaults to 0.01. For a chassis cost of 600,000 c-bills and the default multi, the monthly upkeep would be 6,000 c-bills.

This value can be modified by tags defined on the ChassisDef. UpkeepChassisTagMultis is a dictionary of chassis tags and multiplier values. The values of any chassis tags that match will be added to a 1.0 modifier. The final modifier will multiply the chassis upkeep defined above. Here's an example of the dictionary:

"UpkeepChassisTagMultis" : {
    "clan" : 0.015,
    "elite" : 0.005
}

If the chassis above had both the clan and elite tags, it's final cost would be 6,000 c-bills * (1.0 + 0.015 + 0.005) = 6,000 * 1.02 = 6,120.

In addition, every component currently installed on the mech adds its MechComponentDef.DescriptionDef.Cost to the upkeep total. This value is multiplied by a different upkeep factor, defined as UpkeepGearMulti. For a component with a cost of 150,000 and the default multiplier value of 0.02, the component would add an additional cost additional cost would be 150,000 c-bills * 0.02 = 3000.

Another Custom Component attribute named IBLS overrides the default multiplier. An example attribute that would set the component cost multiplier to 0.05 would be:

"Custom" : {
    "IBLS" : {
        "CostMulti" : 0.05,
        "StorageSize" : 0.5
    }   
}

Upkeep Company Modifier

All upkeep costs are multiplied by a statistic named IBLS_MechbayUpkeepModifier. This statistic is read from SimGameState.CompanyStats, and directly multiplies the total upkeep. For a final upkeep of 100,000 c-bills, if IBLS_MechbayUpkeepModifier was 1.3 the actual upkeep would be calculated as 100,000 * 1.3 = 130,000.

Cargo Storage

Gear Storage

Each item in storage (weapons, engines, heat sinks, etc.) requires 1 unit of storage for each slot they occupy in a mech. A medium laser adds 1 unit of storage, while a large laser adds 2 units of storage. The sum of all these values is then divided by GearFactor (default 1) and then raised to GearPower (default 2). For example, 22 items would result in (22/ 1) ^ 2 = 10,648 units. These are then multiplied by GearCostPerUnit (default 100), which gives the c-bill cost. This would result in a cost of 1,064,800 c-bills.

Gear can override this default size by specifying a Custom Component attribute named Storage.Size. This value will override the default calculation above. Fractional values will be rounded up to the nearest whole number. An example attribute that would set the storage size for a component to 3.75 would be:

"Custom" : {
    "Storage" : {
        "Size" : 3.75
    }   
}

Mech Part Storage

Each stored mech part contributes it's tonnage to a similar calculation. The sum of the tonnage is divided by MechPartsFactor(default 1) and then raised to MechPartsFactor (default 2). For example, 105 tons would result in (105 / 1) ^ 2 = 11,025 tons. This is then multiplied by MechPartsCostPerUnit (default 20) which gives the c-bill cost. This would result in 220,500 c-bills.

Each mech part contributes a fractional portion of the chassis tonnage. The fraction is equal to the number of stored mech parts divided by the the number of mech parts required to assemble a full mech. If parts to assemble is 3, then each part of a 60 ton mech contributes 20 tons. If 5 parts are in storage, then the total amount contributed is 100 tons (20 * 5). Note: Complete mechs in storage do not display a parts count.

For each mech part, the contributed tonnage is further modified by tags on the chassisDef and mechDef. Any tag defined in mechPartsMulti will multiply the fractional tonnage by the multiplier, and all values will be added to the final tonnage. If a tag 'clan' adds a 1.5 multiplier, and the tag 'elite' adds a 2.0 multiplier, each mech part of 20 tons would instead contribute (20 * 1.5 = 30 tons) + (20 * 2.0 = 40 tons) = 70 tons.

Cargo Storage Multiplier

CargoStorageModifier - impacts gear & mech parts storage

Configuration

The mod can be customized through the following values in the IttyBittyLivingSpace/mod.json:

• GearCostPerUnit defines the base c-bill cost for each unit of gear storage (as defined above). Defaults to 100.
• GearFactor defines a divisor that will be applied to the summed value, before going through the exponential growth. Defaults to 1.0.
• GearExponent defines the exponent that will be applied to the summed unit value, after it has been factored. Defaults to 2.
• MechPartsCostPerTon defines the base c-bill cost for each ton of mech parts stored. Defaults to 20.
• MechPartsFactor defines a divisor that will be applied to the summed tonnage of mech parts, after they have been factored. Defaults to 1.0.
• MechPartsExponent defines the exponent that will be applied to the summed tonnage of mech parts, after they have been factored. Defaults to 2.