I do believe this idea has already been mentioned in a chief chat long ago, i don't think it was answered though, but if it'll be like in firefall, an omniframe garage would do the same, aka a man-sized device to choose your equipment, view your frames, change said frames etc... This'll need clarification by Grummz, but it's not something to worry about yet, especially so early in development.
Oh and yeah, just an additionnal info, it's planned that we can and SHOULD have multiple frames, as if, for exemple, your omniframe gets put out of combat or destroyed, you'll have to survive with just your geesuit and perhaps a small sidearm while waiting for one of your omniframes in store to arrive. If you don't have multiple omniframes, well, good luck once that first one is down.