I had the following dificulty making AI drone carriers: When drone increases in size, I need more cargo bays per drone launcher, when I progress in cargo, I need less cargo bays per launcher. Thus it is impossible to make AI design drone carrier which will utilize space effectively. But it is a moot point now after you made 1 drone per 1 launcher
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I was thinking mostly about drone carriers when I suggested "star unstable" throught. However, effective troop transport should use cargo bays instead of starline modules because of much higher damage resistance and lack of defence bonus. Extra space of cargo bays 3 will come very handy for troop transports !
"Sorry Sir, we can not load any more tanks, Ministry of Defence contracted to use cheap cargo bays only"
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I mentioned size of ECM because its higher size takes over the space of two engines, thus making Proportions' drone less effective than standard.
If I am not mistaking, you are going to make max. drone engines 2,3 and 4, as it was intended, right ? Drones are fun to play with !