A transport junk-walker, with a platform added on top and lots of additional junk-armour and stowage, patrolling the dunes and rocky crags of Ferrugo Pass, Tor Megiddo.
It will be ridden by the Custodians of the Gate (who guard the entrance to the Ferrugo Pass - Para-Skitarii and armed Servitors). And maybe occasionally by Anomaly Protocol...
In terms of rules, it will probably just be used as mobile scenery, rather than a walking tank!
Photos of the build are here.