The current iteration of the Arclight Pedals is not compatible with pedal straps at this time. They do have aluminum grip teeth on the surface of the pedal ...

Currently, the Arclight multi-mount is sold separately and can be found here: https://redshiftsports.com/products/arclight-lights-mounts

A rear rack is compatible with the ShockStop seatpost as long as the rear rack is supported in some other way (i.e. the seat-stays or chainstays). Rear rack...

The platform is 88mm x 106mm and is 22mm tall not including the pins (30mm tall with pins installed).