Armory works for me (arsenal sounds like weapons for some reason).
Gu’armori (singular: gu’armoru) are animated suits of armor constructed through the combined efforts of a magicuser of at least 16th level and a cleric of at least 11th level. The creation of a single gu’armoru requires the fabrication of a suit of adamantite-alloyed armor, the life energy of a fallen fighter of at least 12th level, and the casting of the following spells: animate dead, animate object, enchant an item, geas, magic jar, and raise dead. The exact procedure is performed according to a jealously guarded arcane ritual-only three written copies of the instructions are known to exist. The process takes at least four months to complete, at a cost of 35,000 gp for each gu’armoru.
Are we requiring both arcane and divine casters? If we're dropping that, I think we should get rid of magic jar and just go for cleric (like the rest of the spells). I'd go with preconstructed armor, I think. Let's not forget the cost of that, since it's adamantine (I guess full plate).
CR 8 golems have a cost to create around 17,500 and a total price of 25,000 gp. If we tack on "1,000 gp worth of rare tinctures and admixtures" we'll be set.
Alternately, we could require "special inks" and require a Craft (calligraphy) check to draw runes upon the armor.
So something like...
A gu'armoru's body is created from a suit of adamantine full plate armor costing 16,500 gp. Magical runes must be drawn upon the armor from special inks costing 1,000 gp. Etching these runes requires a DC 20 Craft (calligraphy) check.
CL 16th; Craft Construct, animate dead, animate object, geas/quest, raise dead, caster must be at least 16th level; Price x,000 gp; Cost 16,500 gp + x XP.