Hi Jay,
Nice point. The most common recommended ratio is 12 feet of length for every 1 ft of rise. I love it that here in the states people who have never read the Americans with Disabilities Act will quickly attribute various measures to the Act. All the ADA says is “ reasonable accommodation”. ( Because others will be reading this well into the future, in some instances a 1:8 ratio is used. My feeling is that the person in the chair might appreciate the more gentle slope.)
Good point on the landings. My current plan is to place them where the ramp takes a 90 degree turn. I may have a third one added one. One key issue is to allow enough space for the person and a helper to turn around at the landings. I originally thought 4x 4 feet. I am now thinking 6x6 might be more to the point.
Yes, I we have a WC. Of course, there needs to be a realization that another WC might have different dimensions.