This post from the megathread lists some tentative body proportions. In there I say they're 200 cm from nose tip to tail tip. The tail is a bit longer than the rest of the body, so their body is about 100 cm from the nape of the neck to the base of the tail. The forelegs are about 76 cm from flat palm to shoulder. They may appear a bit taller when knuckle-walking.
Anyway, after measuring the proportions in one of my drawings, the legs should be shorter, about 52 cm. Since (for now) I say the hind legs and forelegs are the same length, that means when standing on the hind feet with their legs and back straight, that gives them a total height of about 152 cm from the floor to the top of the skull (so excluding the ears). With the forelegs raised overhead let's say their claws just about brush two meters.
Indoor spaces should probably accommodate a fully upright posture, so lets say the average ceiling height is about 6 feet. This works out great given my stories. in Everybody Poops Together Greg can just about stand up straight in the waiting room, though he bonks his head against a few protruding ceiling fixtures. But he has to bow his head a bit in the bathroom.
I think to further pin down their proportions I should break out some brads and construction paper to build a scaled articulated silhouette.