hey GCinDC,
my IDS dropouts very similar to what you have there had to be filed abit to get my gen1 magic pie into the slot. not bothered with torque arms yet with this build on my scott ransom but when i intend to up the power to this i will remake a set of clamping dropouts at the water cutters for sure. Really intrigued with what you are gonna do here. Today i rode my ransom round a field in Dorset with a horse with no shoes (cause it couldn't go fast on the roads) was like riding slow motocross applying power just to keep the bike upright in the mud. Also found out i need a front chain tensioner at the main chainring.
regards Andy