12onI'm not sure of the sizes of the blanks any more (I'll check later when I have some free time, think they're still on geekhack somewhere) but you should be covered with the blanks + VE.A space bars kit.
12onThere isn't a blank for 2.25u, you'll have to repurpose the 2.25u Shift from either 60 kit or the W67 kit.
A blank 2.75u is provided in the VE.A kit.