First of all, can we please get the name right? It's "xstoys"!
To answer your question, yes, I do plan on a few other Macross 1/6 scale figures; as for a Roy we'll have to wait & see.
If you are looking to recast your custom head, there are a few options available here on at MW. You can contact a few of our local recasters; such as Rohby, Meyersjessee, Valkyrie, mslz22, etc, just to name a few. They may be able to help you recast your head.
Another option is to check out this thread Fulcy put up about how to do your own casting.
http://www.macrossworld.com/mwf/index.php?showtopic=41
Good luck & keep us updated on your progress.