Here is what cube looks like from back, side and front.

From the back, you can see the ports for the circulation hoses at the bottom, the water reservoir above, surrounded by insulation foam, and heat sinks left and right. Its not clear if you can remove the heat sinks without damaging the reservoir.

There is the left-side fan. Noisy! Look to my guide to fan replacement to make your unit quieter.

Those are probably thermostats on top of the heat sinks.