Minimojo is an emulation of an old synthesizer built in Reaktor, available for all registered product owners in the NI Reaktor User Library.
The Juice 3 is not in any way a copy of MONARK. The builder did not have access to or ever used MONARK during the making of Juice 3. Instead, the old ensemble Minimood made by NI in 1999, which has then been modified by several users, has been used as the starting point. I think that the basic structure will be recognizable from that early ensemble.
As the Model D is the most emulated synthesizer the world probably don’t need yet another one. Juice 3 should be seen as a proof of concept; how to emulate the should of vintage synthesizers using the Reaktor environment.
The technology developed for this is called Analog Legacy. Analog Legacy is the theory of modulating all functions in a synthesizer at all frequencies. The key is to find the right balance of the modulation depth for each frequency. Juice 3 is the first attempt to use this theory in practice.