I put PD-A520 on the Duo-shi. The shafts measure almost identical in diameter, with the duo-shi being slightly smaller within 0.05-0.1mm between the outer and inner bearing locations. I don’t have to cut up my shoes! There is about 3-4mm clearance between the grips on my shoes and the due-shi pods.
Q-Factor: 66mm
Total Weight: 355g (both spindles and both pedals) (pedals alone weigh 159g)
Let me know if you want to see something specific, I took a fair number of measurements and photos.