From a long-ago ('96? '98?) time when I was hoping to get other artists to draw Dirty Pair
comics I'd write for 'em*, here's a design sheet I worked up for Kei and Yuri's body proportions.
I originally tried to draw the DP 8 heads tall, but as the years went by, I grew tired of drawing the elongated, spidery legs that an 8-heads-tall hottie's proportions require, and switched to a more reasonable 7-heads-tall (or less) scheme. Also semi-interesting: The '96-era Kei and Yuri sport narrower hips and thicker waists than I'd customarily draw nowadays.
For more DP wackiness, check here: [link] *Like many (or most (or almost of all)) of my brilliant plans, this effort came to naught, as you might already have guessed.