1. Go for the 750. Better, single sleeved cabling.
2. Bottom intakte will suffice. Hot air wants upwards.
3. No Need to. I built 2 S1 with Alpenfoehn Black Ridge plus additional 12cm x 15mm top fan, intake.
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Hi from Germany... found the forum while researching for my last builds (a Kolink Rocket and 2 Louqe Ghosts so far). Now starting to design a practical transport bag for these. Cheers, DS