Wotsitwurf?
No matter what the shocks are off a 250 Kat so far too soft, so need replacing, it's obviously needs carbs which can be sourced from Japan or possibly from an impulse breaking here...
If it has been a runner why rip the carbs off and use them on a tattier one???

Suggest CDI or coil issue , so assume these need sourcing. The engines are usually fine , but it is unknown...
Tokico brakes that haven't been used for a while.......new pistons and seals
So all in all you are buying the bodywork....Tank £150 because it is difficult to source...panels £50 seat £50' same for tail piece ....clocks. £100 fairing. £100 with bracket. Clip on and yoke £80. Exhaust £100 as you need to assume the headers are in need of help.
So Max £400 as you've got to factor in collection.

. To ensure you won't be left too much out of pocket.
Dropping in another engine as a project is an option as we know ....but then the above is relevant .
I still have a soft spot for these ......but years of ownership means after a few seconds of ...ooooh I see the above
