Not related to SOR1 but Bare Knuckle III actually:
A Mean Machines issue containing a preview of BKIII has been recently scanned, check this out here:
BKIII part only: http://www.megaupload.com/?d=3N1XB7LY
Whole magazine: http://hotfile.com/dl/21794993/7d86ef3/MMS017.zip.html

http://nsa11.casimages.com/img/2009/12/26/091226111445930697.jpg
http://nsa11.casimages.com/img/2009/12/26/091226111544220073.jpg
http://nsa11.casimages.com/img/2009/12/26/091226111710758776.jpg
http://nsa10.casimages.com/img/2009/12/26/091226111825423893.jpg
http://nsa10.casimages.com/img/2009/12/26/091226111949900123.jpg

Besides showing a lot of small screenshots featuring beta Zan, it also offers the best view possible on the beta portraits. Nothing particular about the motorbike stages. Skate was supposed to have his corkscrew kick as well.