Slotting the holes was necessary in order to not to have the o-ring rest on electrical components on top of the cpu.
The babs were handmade and are for 3/8 barbs yes.
The pocket is about 7-8mm.
Well i ran a tbird 1400 @ around 1500MHz with this waterblock, vcore around 1,85-2,1V so boiling did occure rather fast 
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Asus A7N8X Deluxe, 2500+@2700MHz (13,5x200), 2x256MB TwinMOS pc3200 @ 2-2-2-11, GFFX 5900 Ultra@500/950MHz, 2x120GB Maxtor Diamondmax 9 8MB SATA raid-0, Prometeia, Logitech z-680. 20000+ 3Dmark2001
Duron 600@1521MHz RIP
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