Walther [waltherpistols.com] has a posted width dimension [w/o slidestop lever] of 1.04", so I went with that. Here's the link to the 9mm PPS page that I used to obtain the dimensions. http://www.waltherpistols.com/catego..._Handguns.aspx.
If you could direct me to an official website containing the .91" slide width dimension, I will gladly and promptly amend the Solo/PPS comparison chart with a graphic to reflect the [PPS] 0.91" slide width.
Therefore, the data and graphics contained in the subject Chart is correct.
Additionally, had I rendered the subject PPS image with the longer [pinky finger base] extended 7-round magazine, it would have obviously added additional height, thus making the PPS look even larger when compared to the Kimber Solo.
One more thing....
The photo posted below shows the view from the top of the PPS slide. You can clearly see the Slidestop. Walther is advertising a PPS width of 1.04" without the slidestop.
Where are you getting the .91" slide width..?