I am not quite sure what you mean by asking for the code - it’s open source. Also it seems you aren’t quite up-to-date, e.g. as far as I know inria isn’t involved anymore. I suggest you have a look at Natron development status? and Crowdfunding Natron 3d Workspace, possibly GUI overhaul with QT 5.12 - #11 by razorsharp as it would probably the most pressing issue if Natron was continued on it’s own (as opposed to e.g. your Blender integration idea), as qt4 reached end-of-life.
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