How complete of a prototype do I require before submitting to savannah?

[Matthew Polk]

I'm not entirely sure how to word this, because I don't want to jump the gun or 
get too far ahead of myself on an idea I've got. I want to toy with 
experimenting with plugins for opentoonz (A BSD licensed animation program used 
by ghibli heavily) and its slight fork (Just more frequent releases and some 
newer features) called Tahoma2D. I know open isn't allowed on savannah as 
stated in the rules, so I will not call the plugin project open* unless I'm 
referring to the parent program.

How plugins work is that you can make plugins most notably in two different 
ways. One is GLSL shaders with OpenGL and the other is in C or C++ (Despite 
being a C++ program, it was designed to allow for C usage) so I thought (Just 
pondering over, seeing what works and what doesn't) with gobject + libvips.  
The question is: How much do I have to have completed before I can submit it 
for review? 2-3 plugins showing it works? I was wondering before I plan to do 
anything. Thank you for what you do. ALso I hope I submitted to the right 
mailing list. Because I know this would go under nongnu.