The Smuggling Compartments attachment converts 25 Encumbrance from a ships Encumbrance Capacity (EC) into hidden storage. A YT-1300 with this attachment would have an EC of 140 (+25). That's pretty clear,
However, the Modification Options allow for two additional storage mods which add 25 Encumbrance. Do these just convert more of the ship's base EC to hidden storage, or do they allow the ship to increase it's overall EC?
As a house rule, I'm strongly considering just removing the line "This still counts as part of the total encumbrance threshold of the ship." from the description. This would mean that a YT-1300 with Smuggling Compartments would have and EC of 165 (+25) or potentially 165 (+75) with both Modification Options.
This change prevents the obvious oddity that any customs official would quickly realize that a ship with smuggling compartments has an unusually low EC and that likely means that there are smuggling compartments aboard. The description for the Smuggling Compartments doesn't indicate that they are taking up space usually used for cargo - which, as I said, would make them pretty obvious - so this makes more sense to me. Any opinions?