Dennis,
In your first post in this thread you seem to be describing a Dart boomless, daggerless, simple. I see a lot of people sailing their Dart 18 solo, perhaps someone can tell the weight/length required to right one solo. There are a lot of Dart 18 about in the Netherlands, you should be able to pick one up that fits your budget. Furthermore the Dart has an active class organisation over here so you won't be alone. Keep in mind that spending a bit more when you purchase the boat might save you more than that cost to replace worn parts soon after buying. After you factor in costs for gear, a place on the beach during the season and storage during the winter, it might be wise to buy a boat that you really like to justify those costs. But if yiu want to go catsailing you'll find a way to make it work. Hope to see you on the water soon, Succes man!!