Body venting taken to a new level. Looks too rough to have been done by the Xray gang, though. Not their style.
I like Xray provides centerline holes for balancing the chassis. Something I've been wanting to do on all my chassis to consistently check and set balance from the same point every time. Doesn't look like Xray through-drilled the holes? A shallow hole on the underside would be all thats needed - probably along the axle centerlines FR and RR is where I'd put 'em.
When I win the Texas Lottery, first thing I'm going to buy is an Xray. -AC