After some thought, I decided to give it a shot and try to make keezer and fermentation chamber in one.
Actually it will be a two freezers connected via flexible or PP tube, where blowing and exhaust will be performed with PC fans controlled by STC100.
Freezer for fermentation is set vertically (like the fridge) so it takes up less space.
Nothing without Sketchup..
So far, I removed compressor, painted old freezer lid in black and drilled intake pipe.
We'll see how the project will evolve in the future..
Greatest challenge besides maintaining the fermentation temperature will be preventing moisture entering into the system.