Allen, have not had a chance to open up the boxes. I would imagine these are mirror-image pairs; so is this accomplished by the parts being keyed or is a right simply and upside-down left due to symmetry?
PS, to others who do a build this complex; there is another glue option I have used on every build I have ever done; including furniture with complex joinery. It is Liquid Hide glue. It has an open time up to 90 minutes (cool environment) and is VERY strong when cured. Makes things less panicked then 10 or 15-minute open times on glue. The only downside with hide-glues is that moisture can soften the joint temporarily until it evaporates. But that much moisture would destroy an MDF construct so not a practical concern anyways. Also, it cleans up (both cabinets and clothing) with a slightly moist rag much easier than an aliphatic compound (yellow glues).