I didn't end up sending the first one back as I got my motor mount the day I was going to ship it back and it had a cover for that hole, so I wasn't sweating that, but then I went to screw stuff down and the holes weren't deeply countersunk enough to make the screws flush with the bottom of the chassis (Screws sad .5mm-1mm below chassis). I contacted John about tips on cleaning up the countersinks since I would be going into carbon and never heard back, but when it came down to it, there weren't any reliefs in the chassis itself for things like the steering posts, so if I tighten those down, I likely would never be able to remove the screws easily like I can with the stock chassis, which has reliefs to limit the rotation. The pictures above have nice neat reliefs for what appears to be the steering posts and additional ones under the diffs, etc. Mine also was narrower in the front where the diff mounted, which seemed like it could end up being a chassis break point and the diff holes were crudely cut. Not as professional as I was hoping I guess. I'm thinking about taking it up with Matrix to see if they can make me something or bugging the company that makes 3mm chassis to see if they can make me something up. Seems like since they're CNC aluminum, it can be a lot more exact.

I just can't help but look at the chassis in this thread and notice how much more professional and thought out they appear to be compared to what came to me.