Hi!
I am curious what the highest logistics numbers can be and also space in a huge ship design
IIRC both have hard-coded limits. For logistics the number 150% of player's max pops out from my memory, but I can't claim it's really true. Again IIRC it was introduced after some players reported some insane logistics numbers, when they caputured lots of "Hyperion Logistics System" buildings.
For max miniaturizatrion my memory's completelly blank.
Sorry.
Can I expect some races to re-appear after being wiped out?
Mayor races definitely not. As for minors...

Never had one, but I haven't played really lots of games to safely claim that's impossible..
BR, Iztok