Hard figures can be found in the last annual report and...

Hard figures can be found in the last annual report and announcements since then.
Here is some rough figures to get you started
http://spreadsheets.google.com/pub?key=p4y0P6tzJXmByK7-TOoDeVQ&gid=2
They are out of date due to the project scamalot, but do show a quick way of considering asset impairment. I might add some more details over the weekend.

Here is a process you may wish to follow:
Look at balance sheet as little else matters at this point in the game. Update based on recent events.
Then:
1. All debt is 100% real, except TREES if company survives to exchange that for shares.
2. Start with big ticket assets and decide on a likely value, e.g properties, are they worth full amount, 50% or less? Ask around, or IIRC there is a good link in a thread I'll link below.
3. Work through each asset and discount as you see fit.

Last time I did that as a TREES holder I decided there was enough assets to be confident I'd get more than 20% of face value, which was the price TREES were trading at.

This thread may help, earlier HC GTP thread, though I see you posted on it. Now I wonder why a guy who has been following this story is asking such a question. What are your thoughts on real NTA?

Apologies if this is telling you how to suck lemons, it's hard to know what skill set people have.

TREES only