I've put together a little spreadsheet like this:
I've weighed most of the parts and posted the weights on this forum a couple of years ago. The engine is the only component I sadly forgot to weigh, so the figure is a guesstimate based on some web searches.
As you see, it's coming out at ~530 kg empty. I'm fairly certain the real figure is not very far off.
The F/R distribution of the various items are just my guesstimates, but I think they paint a realistic picture altogether.