Thanks for the kind comments everyone.  It's kind of funny looking back on how much I've learnt.  When I started, I didn't know how to even raise the pf properly!! Then I didn't know how to remove it!  The only way I was able to work things out was with the help of this and other pinball forums.

Where possible I tried to keep original parts for the pin.  Often this was also the cheapest way to go if I excluded the value of my time.  With the clock boards and the SW26 trough sensor, the cost of replacing all the components was a fraction of buying new boards and a lot more satisfying.  The same went for fixing up the mini pf planking, it was cheaper and more enjoyable to repair it.  For me a lot of the pleasure has been the process of doing the renovation so I wasn't too worried about it taking a long time (apart from the nagging thought that despite all the photographs, I might have forgetten how it all went back together after being apart for such an age).

I've already got my next project sitting in the shed waiting for me to get done all the other things I neglected whilst working on my TZ.  It's a MM which needs a full renovation including a new pf (which I also have waiting).  Should be a breeze after the TZ!