Single and dual extruder heads, heated work platforms and filament guides are available as experimenters and replacement parts. I am looking at either using an adapter to clamp the head assembly in place of, or machine a head adapter to mount both side by side and string the controls. Before anything, I want to learn about the programming language and interfaces to see if the printers use something similar to GCode or if a separate control system would be needed. I have no doubt a taller Z axis would be needed or I am going to be stuck with very short printings 
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I will be glad to share and if anyone can offer insight, I would be most appreciative.