QUOTE(DiscoPants @ Sep 27 2009, 04:10 PM)

If you remove wood as you suggest you will fundamentally undermine the arching and greatly reduce the strength and rigidity of the instrument with all kinds of unwelcome consequences. The fact that the blocks and linings will remain is of no help here. You wouldn't expect to be able to randomly remove parts of a road bridge and still expect it to carry the same loads just because you hadn't removed the foundations, would you?
Why not buy a cheap solid body electric instead and hack lumps off that until it's light enough for you?
Why don't you get a cheap Chinese electric (like an Aileen 501) if the sound doesn't matter? They are lighter than normal violins, but very quiet unamplified, so almost work like a silent violin. Something like this:
http://www.a-violin.com/product/109-electr...in-ve501--3a5e/I got one and modified it a bit myself, because the sound quality isn't great off the shelf. I had to change the bridge a bit since it didn't have full contact with the pick-up strip, and it desperately needed decent strings, because the ones it comes with are appalling. If you ever want to use it with an amp, you'll also have to get a decent lead, because it comes with a TV lead (!), and I don't need to mention how that sounds
After a bit of work, it doesn't sound too bad though, not much worse than the rather nice looking but rather heavy Bridge E-Violin I bought second hand - and it sounds better for Folk since it still has a wooden body, unlike the Bridge, which is great for Pop and Rock. For everything classical, I still use my good acoustic one, nothing beats that one anyway.
If you only want it to practise and look for a lightweight option, it is not too bad considering it won't break the bank.