Converter size?

Well, no more than a 1/12 pitch. gotta have a 5' landing top and bottom, minimum witdh is 3' , I usually go 4' (have a Bro, my Ford Friends older Bro, he's A Big Man. Bone Cancer. We just did him one.)
HAS TO have Protection on sides( aka handrail) if over 30' additional Landing required. I can go on, if it helps?
We have a 90 degree walk. One straight out from the bottom of the steps and then one at a 90 degree angle to the right about three feet in front of the steps, so it's going to have to have a landing even with that right hand walk, since that's the one we use. As usual with a woman, it's complicated. LOL