Usually you can access a service panel to where the fan and evaporation department is.
I don't know about a wood but I did work on an upright not long a go and took some pics.
See the drain hole below the fan on the floor there?
Thats what ya gotta clear. I use a shop vac myself but I let the freezer thaw all the way out , you could use a hair dryer to melt the ice.
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