So my mother's wall oven has died; the problem is it's from the '90s, and is somewhat larger than the current standard size (in both height and width).

This means the hole in the kitchen panel it's inserted into is too large, so I'm assuming the easiest/neatest way of sorting this is to replace the relevant panel, as shown in the photo:

What are my best options to achieve this? Would this be a standard panel that kitchen shops would stock, or would I be able to get such a shop to custom-make me one? (The colour of melteca would need to be close, at least.) Or would I need to go to a cabinet maker or similar to get the job done?

I'm in Palmerston North - can anyone recommend any particular place that'll do it relatively quickly and at a not too bad a price? (My mother will be without an oven until this is fixed.)

Thanks.