Hello Fleasome,
Welcome! That is so cool that you and your girlfriend are going to troop as Grand Inquisitor and Temple Guard! [Balancing the Force.]
For quick introduction, I have been working on Grand Inquisitor for Florida Garrison - Everglades Squad.
If helpful, to the share some options from the path I have taken:
My Grand Inquisitor silicone mask was custom made by Mr. Bungle's FX.
My soft parts are by Khloe's Custom Costume Shop.
My belt is made by Mr. Kerry Alan Rowntree.
I also have a second belt made by MagMel Creations.
My boots are from Imperial Boots.
I commissioned JMS Props to make Grand Inquisitor 3D print files for armor and helmet. [JMS Props has the files available for sale.]
My Squad mate who operates the Plastic Arms Dealer shop will be printing and finishing the armor items for 501st approval.
I also have a Grand Inquisitor lightsaber (aluminum/PVC version) in progress with Rebellion Outpost LLC.
Hope these suggestions are helpful.
Look forward to approval soon!