I am working on a project which will take years but is worth. It's about a 1:24 scale model of the Clark 75B tractor shovel, a wheel loader belonging to the small range of wheel loaders in the Clark and Michigan range. The scale model is divided into two phases: 1) 3D CAD drawings based on authentic factory drawings and dimensions, and 2) solid model thru rapid prototyping process. The number of scale models is undecided yet but it should be limited to 500. The budget is huge and around 40K, the reason why I need to think wisely and take my time for such a project. But once set, you wouldn't believe your eyes how detailed it is.