just going to try uploading the file again... http://files.engineering.com/getfile.aspx?folder=adaf5e47-1013-4538-baec-0a7196a1062f&file=part_11991(bc).SLDPRT
Not sure what you mean about keeping sketch perpendicular coupled with 15deg angle change - the two are potentially exclusive ideas. Take a look and let me know if this is right idea...