Be aware that recent anti-fouling might be cosmetically covering up rusty thin plate or it could be genuinly there to add to the value of the boat and also to stop weed growth - either way you never buy a boat without a survey unless you know what your looking at !
What a boat is worth is calculated by how much someone is willing to pay

If its in need of a wheelbarrow full of £20 notes to fix her up then the offering price should reflect accordingly.
I might be completely wrong but the propellor doesnt look like its designed for the nozzle. It should have broad flat tips with 10mm clearance - the photo shows what looks like a standard propellor
If I'm right a propellor to suit the nozzle would cost several thousand pounds new unless you're extremely lucky and find an identical match secondhand which will still be quite expensive. Hopefully someone will correct me if I'm wrong
If the survey is good and you get her for a reasonable price then you've brought a boat thats got character and has probably seen some of the roughest weather in the English Channel.
There are probably loads of 'liveaboard' ex-dutch beam trawlers in Holland where you could get ideas for the conversion.
If you ask nicely I'm sure they would show you aboard ........ I'm told the Dutch are very nice people
Good luck !!!