A lot of people are PMing me questions about what they should order for a specific configuration. I will gladly answer your questions as I can, but the whole idea of the "kit of parts" is for you to be able to customize them the way you want. You may have to just try things out until you get a configuration that works for you. I will have some extra parts after the orders are fulfilled in case people want to order different arms or what ever they may need.
-YetiStand Alpha can hold one valk, as is.
-For every Valk you want to add to the stand you need to add a dual arm.
-XL arms help spread things out when you are attempting to display more than one valk on the stand.
You could theoretically have 10 arms for valks on one stand. I would not advise this. I think the 4 stand configuration will be cumbersome for anything but the 1/60 yamarcadia VF-1's.