VECTOR: WG6100 HVU cage necessary?

As some of you have already heard, I have purchased the rights and  inventory 
to Tom and Fred's vector replacement boards.  I would like to off  plug n 
play solutions for these boards.  Specifically, WG6100 HVU with  cage.  No mods 
needs, just p n p.  Also I will have the Amplifone HVU  modded for plug n play, 
no need to hack the harness from an original.  So I  wonder if the Wells 
needs the cage.  Amplifone doesn't use a cage, so I was  wondering.  If it does 
need a cage, or if using a cage is just a good idea,  can somebody confirm that 
aluminum is the proper material.  I just to make  sure before taking the part 
to the machine shop for pricing.
 
Thanks
 
Dave
 
+++++Ask me  about Retrocade 30-in-1 MultiPac kits for Midway Pac Man and Ms 
Pac Man boards  and same kit already attached to a new JAMMA PCB. Also we now 
have purchased the  rights to WG6100 (Tempest, etc) new deflection boards and 
HVU boards. Also HVU  boards for Amplifone (Star Wars). These are version 2 
with no extra wiring or  mods necessary. Ask about Star Wars overlays and new 
cabinets for Midway  cocktail, upright, mini, Dragon's Lair, Williams, Golden 
Tee Fore, and  Ultra-MAME++++