Well, having slept a good nights sleep on this thing I feel more positive about life and one particular Spitfire project as well...

Using tungsten as weight is of course a good idea, how ever it is not that easy to come by and it's melting temperature of some 3500 degrees centigrade makes it practically impossible to cast. (Tin has a melting temperature of 230 degs C and lead 327 degs C) The available space up front in my case is such that it would be very hard to use material in "bar" form.

Today it's pouring down with rain, so I'll setup the plane for weight measurements when the weather clears. My wife would kill me if I tried to do this in our living room, which is the only room big enough to house the Spit in one piece.

I'm sure that after I chance the control surfaces to built-up ones, I can get the C of G to maybe 27-28% with usual ballast materials. I think this is a fair starting point for maiden flight. Any input?