There are two approaches used when considering whether to restore a car:
1. The Logical Approach
Will it be even vaguely worth the $$ I need to spend on it, incl purchase cost.
2. The Suffer-For-Your-Art Approach (aka Hip Pocket Trauma Syndrome)
Logic is out the window,
no one can convince you of the folly of your pursuit,
and some even insanely agree with you (i.e. they want one too! Preferably yours....)
Browse the UK sites and read their magazines.
It's truly amazing what some people think is worth saving. I do know people ship rusty Escort Mk1 shells back to England, because at least most of it is still there, and not just red dust on the floor.