Motor launches have undergone a big revival in the last few years. Plenty of people like to tinker with the petrol engines that suit the smaller designs, and they need a boat to put it in. Here is a range of craft to fit the different motors.
The bigger boats take a diesel, an economic way to cruise. The 8m design, with its outboard in a well, is another means of getting around on a smaller budget.
Realistically you are looking at up to a years work on a part time basis before the smaller craft are ready to launch, and another year at least for the bigger designs. But it's very satisfying to put the time in and thoroughly know both the structure and the mechanics of the craft.