Gearbox undertray disintegrating

I am in the process of undersealing my mk 2.5. The steel tray under the gearbox has rusted and is disintegrating at the front edge.

It seems to be quite difficult to find a replacement for this - I’ve hunted around for aftermarket and second-hand parts with no luck. MX5parts have some but not for the MK2.5.

I came across a few discussions which suggest the part isn’t needed - so perhaps I could do without it. Another thread mentioned a homemade repair job - presumably bolting or welding a new front edge onto the shield.

Does anyone have an opinion on whether these undertrays are necessary and should, therefore, be repaired?