I've decided that I want to make a timber camera slider using a drawer-type design... using materials from Bunnings. I spent that evening making the the drawer... here it is.
Update: Unfortunately it can't take the weight of the camera! But I've managed to couter-balance the weight and have the camera connected with my 'grabby' tripod on the end:
Update 2: I've managed to get some footage of Rocks, the surface of a pineapple and some skin but in this last respect, I feel like I've failed. I cannot work out what is wrong but I can't get enough light into the camera when it is zoomed in further. I'm failing with the 5D.