D Special rehabilitation

Hi all, I recently purchased a "barn find" 1971 D Special which I will be rehabilitating for casual use. I won't be restoring it, as after
looking through some of the threads this can soon become a bit of a
wormhole with a D. Car has had one colour change from white to black in
its deep dark past but this paint job is also well past it's use by
date. All panels appear to be original to the car as there are traces of
the same shade of white on all the undersides. It has the usual rust
areas needing attention (the boot lid is a shocker) but I will be more
focused on "freezing" the oxidisation process at this stage rather than
cutting and welding. The car seems pretty sound, the doors all open and
close the same whether it is sitting on its wheels, lifted by the
jacking points or raised a 4 post hoist. The interior is tidy for a 50
year old and 95% of the rubbers are in amazing condition. The engine and
trans seem sound and the hydraulics do everything they are supposed to.
Time will tell I suppose.