Max, the cranks are the SISL2 with a Leonardi Racing XX1 spider. The frame has a standard BSA 73mm shell, and I'm basically running the Cannondale BB Kit
they sell at R2Bike (comes with a 132mm spindle with no lip) with a few mods:
1) The bearings felt pretty tight, and I fancied some bling, so I replaced the cups&bearings with Zipp Vuma Ceramic (unbelievably smooth bearings) which have the exact same dimensions, but somehow weighed 20g less (happy coincidence)
2) I didn't like that the dust shields sat 1.5mm+ away from the bearing face (and a bit beyond the cup outer edge) because I felt that dust and dirt would easily find its way into the space. So I ground down the lip on the shield by 1mm, leaving behind a 0.5mm lip, and the dust shield now sits "within" the cup rather than protruding.
3) I didn't want to use all the delrin spacers because it seemed too ugly for this build (they'd be visible on the NDS), so I figured out that with my thinner dust covers, my NDS spacer needed to be 9mm to center the cranks, took a 10mm 1 1/8" carbon headset spacer and machined it down to 9mm thickness and from 28.6mm ID to 30.0mm ID. On the DS I needed only one 1mm spacer plus the wave washer.
The nice thing about the SISL2 in this setup is that the Q-factor is I think 5mm (or was it 2.5mm?) narrower than with the SISL because the arms are a slightly different shape.