It would make more sense if cloning was a Gungan speciality (most of them look the same for some reason).

Jar Jar even claims to have "A grand army".

The Kamino cloning centre seems to be mostly underwater, it could be reworked that they are using Gungan methods to produce the army for the Republic.

Heck, Jar Jar could be a failed clone explaining why his body is so uncoordinated.

It could even explain that bizarre power station that Maul fights the Jedi in (though in my take it's moved to the Federation control ship).