My suggestion is to attach plywood to both edges of the existing ramps with screws, and continue to do so until the desired width is achieved. Consider using small pieces of the plywood to serve as spacers/shims between "full" pieces of plywood, to add width with out using solid plywood.rsmithtesiusa said:
see my post just above yours - is that what you are talking about?
Your diagram seem to add the plywood to the vertical thickness rather than the width, but I may be misinterpreting it.