I have plans to upgrade the binaries of the exporter, for the next release of LuxRender.
Before, I would like to refactor some things and implement new ones.
Work has already begun, and I hope to finish it on time.
I will be happy if someone offers to compile 64-bit versions.
Although the project is not originally mine, I would not let him into oblivion.
I think that LuXSI has much potential, and it would be very sad to lose all the work done so far.
You can find the code of Luxsi in this link: http://src.luxrender.net/luxsi/
I leave here some images..