Moving on from the sprockets*, I like the belly layout. It's obvious you've put a lot of thought into it, which is always good! A few little things:
- It's hard to tell from the iso how much room you have in between the Talons and the DS, but think about wire runs. I'd advocate for routing each controller's power wires paired along the belly pan, but space might get tight. Running to the compressor switch will also be a bit of a haul. (Not suggesting any design change there; just think about your desired route. You might consider moving the spike.)
- Can anyone report good competition success with mounting the D-Link so close to/inset within metal? We try to keep it as far away as possible with clear line-of-sight. If something like this works, it's a really nice design constraint to avoid! Seems like a secure location otherwise.
- In addition to chain clearance (OD sprocket+chain vs. OD wheel), keep an eye on your wheel-bumper clearance. You don't need too much, and of course increasing it shrinks the usable drive base, but I've seen people design
way too small a gap. I can't tell what yours is from the iso, but remember that bumpers can flex a bit, and they make really bad brake pads for running wheels.
- Vertical batteries are definitely convenient, and from here the box looks pretty stable, but don't underestimate the moment arm of a vertical battery. At the least, I'd keep in mind having continued access to tighten those flaps' bolts. Around the ~40 match mark of being routinely T-boned, the box may start getting a little upset.
- An even more minor nit pick: I can't tell the distance between the air tanks and the frame rail, but you might want to use elbow connectors on the outside plugs so you don't have to worry about where the tubing loop is while it's so close to the DT chain.