I agree the Nash needs a full refurb however its worth noting some work is being done! I was at PBB on saturday and went on the Nash, it was the roughest coaster on park but also the most fun, but when i went on the monorail and whilst in the queue for Nickolodeon Streak it was easy to see the scaffolding currently worked into the supports of Nash and you can see they are replacing the wooden supports in the main lift hill. I would guess that once they have finished the current replacement scheme it will recieve a much needed paint job as it looks terrible at the moment, particularly when seen next to the newly painted and refurbished Nickolodeon Streak.
I live in the Blackpool area and the scaffolding supports that you have described have been attached to the top of the ride for well over a year.
I got the impression that it was holding the top of the lift hills together (like a brace).
The Nash looks really dire when you stand and look at it from Bond Street.
The ride looks like a shanti- esque pile of dirty wood, It amazes me the coaster has been so overlooked as it is the parks jewel in the crown coaster.
I think the only reason it has been left to fall into such poor condition is that Valhalla hides the ride from visitors view and this has allowed the park to get away with neglecting it (Valhalla hides a multitude of sins)
The ride needs a total overhaul, proper nuts, bolts and new timber followed by a repaint in a colour that will be long lasting and make it look like new -a lovely chestnut brown stain would be perfect!
The white paint on the coasters does not last and turns dirty and develops rust patches very quickly with the heavy salt air.
I truly hope it does get the attention it is crying out for next season, I do worry it is being left far too long!