1.) You don't RT fillet welds in in the AWS codes.
2.) D1.1:2003, Figure 3.17 denotes:
a. plate lengths = 12"
b. vertical/horizontal plate widths = 6"
c. 2 bends (fracture) and 2 macros required.
3.) Just finished running about 9 AWS D1.2 WPS/WPQR tests. Have fun.