Not yet 100% sure - but it seems to me that providing your own kickstart file to installer will completely override our kickstart - so in order to do fully automated installations over PXE I would suggest you to edit ks.cfg taken from OpenNode ISO installer and just replace some lines with lines from your anaconda-ks.cfg - in order to further automate some installer dialogues like root password setting, networking parameters, partitioning, etc.
I'll attach the original OpenNode 1.0 stable ISO installer ks.cfg file.