Align UVW Map modifier to longest edge in mesh?

for o in selection do (
 
	if isvalidnode o == true then
	(   
		---- Switch to modify panel, collapse objects to editable poly, select all edges.
			max modify mode
			addModifier o (Edit_Poly ())
			maxOps.CollapseNodeTo o 1 true
			subObjectLevel = 2
			actionMan.executeAction 0 "40021"
			selEdgesBA = polyop.getEdgeSelection o
			if selEdgesBA.numberset != 0 then
				---- Find the longest edge and select it.
			(
				longestEdge = undefined
				minLength = 0
				for ed in selEdgesBA do
				(
					edgeVertsArr = polyop.getEdgeVerts o ed
					edgeLength = distance (polyop.getVert o edgeVertsArr[1]) (polyop.getVert o edgeVertsArr[2])
					if edgeLength > minLength do
					(
						minLength = edgeLength
						longestEdge = ed
					)
				)
				polyop.SetEdgeSelection o longestEdge
 
				addModifier o (Uvwmap ())  ---Add UVW Map modifier and set to Box Map
				o.modifiers[#UVW_Map].maptype = 4
				o.modifiers[#UVW_Map].height = 5
				o.modifiers[#UVW_Map].length = 5
				o.modifiers[#UVW_Map].width = 5
				subobjectLevel = 1
 
				--- Now I need to align the Z Axis of the UVW Map Modifier gizmo with the longest edge. How?
 
			)
			else
				messagebox "You must have edges selected" title:"No Edges Selected"
	) else (print "no geometry selected")
 
 
)
 
 
	completeredraw()
 
 
<code>
 
All the script does for now is select the longest edge in the current editable poly.
 
 
What I'm stumped on is how to get the gizmo of a UVW Map modifier to align with this edge. Basically align the Z-Axis of the gizmo with the length of the edge.
 
Has anyone done this before and willing to share some wisdom?