ORI struts would be the preferred units for this rig for certain. I've got a pair in my cart at a few different parts houses watching prices float around, but that's some serious coin to drop on this parts bin.
So far other than the sniper kit, this rig has been assembled from stuff I had laying around, fabricated from scrap or bought used / junkyard parts. I suppose the more capable it becomes, the more challenging trails we hit, the more legit the parts list must become. Otherwise I'm in perpetual leaf spring replacement...