Perhaps, the holes used to mount the existing, narrow outboard belly panels, could be 'recycled', creating an attachment point for a 'new', single, full-width belly pan section which spans the entire width of the underbody, losing the two small panels in exchange this solitary single new panel. Section by section, front to rear.
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My CRX has a bunch of existing 'holes' underneath the car. I found that 1/4-20 RIV-NUTs fit these holes exactly. I cleaned these areas with 91% isopropyl alcohol , plus the RIV-NUTs, and wearing Nitrile gloves ( Harbor Freight Tools ), I applied a thin coat of J-B Weld epoxy before insertion, to help prevent 'spinning loose' when bolts were installed, or removed ( give the epoxy at least 24-hours to set, before using ).
I was able to pan then entire belly without ever drilling any new holes.
