Silver players who had previously been gold, or who have purchased foundry project slots with Dilithium, are able to access the foundry. There was a bug that was preventing players from accessing the foundry, but that was fixed quite a while ago.
I guess mine was part of the 1% too as I can't find it. So when the Foundry editing is enabled again, I can find out why at that time?
"There is no problem in the universe that can't be solved with a bribe, a paid assassin, or an overpowered fighter." - Chubain from Jumpgate Evolution