You got me thinking about the legality! I did not think about the rules when building this, it is purely an experimental exercise at this point. But your question got me to see what the rules are.

These are the ones that seemed pertinent.

-Spoilers may not extend beyond the width of the body.
Not sure how this would apply to the side pods. If this would be considered a spoiler? The rules do say "Buggy and truck bodies used in ROAR-sanctioned events should resemble those used in full scale off-road and stadium racing". And I have seen some full scale off road buggies that have in-closed nerf bars that aid in aerodynamics. So using that logic the side pods should be legal? But I don't think anyone has tried this before.

-Where permitted, add-on spoiler material must be securely fastened to the
body.
I think this makes the window extensions legal. And they are narrower than the rear pods.

-Off-road wings may be mounted using wire or fastened directly to the
chassis. There is no minimum clearance for off-road wings. Front wings are
allowed if utilized on the body's full-scale counterpart. If allowed, front wing
dimensions are specified in the class rules.

-Front wing max width 127mm, mine 91mm. So.... That's legal.

-As for the rear diffuser. There doesn't seem to be a rule. Guess that means it legal.

-I wasn't able to find anything about the rear arm mud guard/wings. The rules just state that wings must be fastened to the car. There is nothing that says you can't have multiple wings, if these are classified as wings?

So.... Is it legal? As far as I can tell yes. But buggy aero continues to evolve so at some point ROAR will limit it I am sure. The rules are so wide open at this point I encourage people to test thing and see what works. Even if it is illegal. That might spur on an idea that might be legal. If nothing else it should make racing more interesting, I get sick of everyone's car looking the same. That's why I have ordered parts to start a new carpet car.