Making the incubator taller for goose eggs

[cottontail farm]

Hi everyone,
The geese are starting to lay and I'd like to set some eggs in my Styrofoam hovabator. I've successfully hatched chickens and quail but am worried that the interior space is too low for goslings, like they're going to bonk their head on the heading element once they're out. Has anyone successfully rigged their foam incubator to make it taller?

 

[nchls school]

Possibly the bottom can be changed-removal of screen bottom, etc. I'm looking at my foam incubator and I believe there is enough headroom.