Anyone else thinking Macross here? Because habitat ships + the capability to launch hundreds of missiles from a single vessel sounds suspiciously similar.
Also, I got that 145,000 limit JD ship to the point in question and it worked fine, so it looks like I was correct that the mass limit for the drive has to be greater than the total mass of the squadron being transferred. By the way, I agree completely, but this system is know hostile territory, only partially surveyed. I've already lost a survey ship in there and my scout I sent to investigate found 3 contacts, that when painted with active sensors, had masses of roughly 3/5 of my current mainline destroyers, before being destroyed without gathering any additional information. As the system's only "habitable" worlds are a pair of Nitrogen/Methane moons with respective temperatures, pressures and gravities of (-184.6C, 0.19, 0.44G) and (-153.4C, 0.39, 0.63G), I'm assuming the hostile forces warped in from another link in the warp network.
I only have one other JP in the system ided, which means that unknown levels of forces from an unknown system and direction, who have Jump Drive capability, are out there somewhere, and I'd rather not give them a highway straight to Sol. Although that is my current longest chain, with 4 jumps between Sol and Niven, so I might build one after I develop defensive mines and WP fortresses.