I have the CDP Mid 600 plan but either mine is an early model (it has a 2.5 OD box section dipper) or Ray has altered his to have boom & dipper of equal type box sections. If this is done do you have to alter the bucket curl linkage in any way from std. 2.5 box sectional dipper as on plan. The scheme uses a quite rare closed pin centers length cyl from 'Princess Auto' - also expensive. In my country there is now a very close metric equivalent from Flowfit / Harrier Fluid Power - this may make building this more practical for me (or others based in Europe). Sorry it is such an old post but there is little info re the CDP kit builds