What props/armor are a must-make in the DIY world?
Also thinking of a long term project of a chiken-walker mech costume, exoskeleton costume (NOT Iron Man), or AT-RT. What do you think?

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I'd suggest picking a time period and persona, and building a complete set of equipment for that character. Then pick another and repeat. OR, pick a theme of some sort and use that to suggest what you might want to display in your collection.
(Personally, I've got a very specific idea for scale mail -- purely for costume-contest purposes -- which I will tackle someday, but other than that I'm not interested in most weapons or armor for their own sake.)