What are these remaining parts of the Case WX120 excavator?

None of my searches turned up anything with actual visual/structural detail on the WX120's panels, undercarriage layout, or engine bay hatches, just generic parts-store and marketing pages with no technical substance on this specific model's body panels. This is really a 3D-modeling reference question, not a repair diagnostic, and it needs walk-around reference photos, not a fault-code style answer.

I don't have a verified source describing that specific hatch behind the boom, the drive shaft area, the two undercarriage side boxes, or the engine-access panel on the right side of the WX120's housing. For a wheeled excavator like the WX120, plausible guesses would be: the hatch behind the boom is typically a battery/electrical compartment or hydraulic oil filler access, the undercarriage side boxes on WX-series wheeled excavators are usually toolbox/storage compartments or the outrigger/stabilizer hydraulics housing, and the driveshaft runs from the transmission to the axle differentials since the WX120 is wheeled, not tracked. But none of these are confirmed for your exact machine and I won't state them as fact without a source.

Since this is a build-reference question rather than a fault or spec question, your best path is a WX120 parts catalog (component breakdown by panel) or straight walk-around photos/video. Case's parts lookup sometimes includes exploded diagrams of body panels that would show what's behind each hatch, and used-equipment listing photos from multiple angles (auction sites, dealer walk-arounds) often capture the underside and side compartments that stock spec sheets don't. If you can find and share a WX120 parts catalog PDF or specific listing photos, I can help identify what's in each compartment from there.