Wooden frame for single oven

[goppo]

Hi all,

We have recently replaced a double oven with a single oven, but the new oven is not as wide as the old and couldn't be mounted to the cupboard. Here's a photo:

 

 

I'm thinking of building a wooden frame for it and having a shelf above it. The gap on each side of the oven is around 60mm. Could something like this do? 

 

 

where the oven sits between the the two 'stands' underneath a piece of plywood. If so, what timber size should I use for the frame?

 

Any advice appreciated. Thanks.

Edited September 2, 2020 by goppo