If you view it in terms of what it'd cost to build then it is a bargain at $25k.

But you have to be sensible sometimes and think about how it will sell if you have to and what detracts from its value. This is how I see it:

Being only a 4.2 devalues it compared to a 308 example.
Not having the original engine hurts a bit, but not as bad as it would to an original 308 car. Simple fix is to put a 308 in it or an injected engine.
Non original paint may hurt it a bit too.

In the end I wouldn't pay much more than $20k, $25k at a stretch. Having said that personally I wouldn't entertain it as its green, but that is my personal distaste of green coming out!

Hope that helps!