I'll string these rqts 1 piece but with a slight difference, I strung the long side on the (indicated) short side so that when I do the short side I run it along the top cross. The long side continues on to the crosseses whereby the long side's 1st cross is the 2nd cross form the top.
This can also help if you want to string the rqt 1 piece but you started to string it the wrong way round. If you have enough string on the short side just run it along the top cross.
The only word of warning is that you'll need a starting clamp to hold the top cross in place until either a clamp becomes free and you can tie it off as normal, or you've finished the rest of the crosses and tied-off at the throat. You'd then have to go back clamp the top string and then tie-off as normal.
Regards
Paul