Thanks, but i never download unknown pdf files, sorry, as a Unix /Linux user you learn a lot.
Back on track, I'm not phased by complexity by the Marchwood project. I can visualise lay out and schematics very well, complex math formula can be my weak spot, although i usually get there in the end.
Cost is a factor, and some physical ability problems as well at the moment )-: more the hardware work involved, although ABS can make life easier in some areas. Just thinking lately, after nearly 12 years as a hobbyist I've never bread boarded a project, maybe its time i did.