Looks great!
I question how the geometry can be almost identical since we never actually CADded our version, but I'll take your word for it.
Love the use of the pancake cylinders, I wish we could have used those on ours.
2 things:
1) If you're planning to run the chain inside the tube between the gearbox and the drop module, you may want to consider how your gusset for the cross rail attaches to your side rails. (looking at you KohKohPuffs
) Trying to run a bolt through the tube there would really mess with your chain, and the rivets may not give you enough clearance either. My first thought for a solution would be to use two angle pieces on the sides instead of a gusset on the top.
2) As an offseason addition to our grasshopper drivetrain, we modified the center module to be able to actuate up and down. This actually reduced the drag and made the whole drivetrain much more smooth. In fact, after a match at our first offseason event, a friend from another team asked if we had added 2 more CIMs. Not a necessity, but we found it to be a big help.