Hm. That layout is actually written in S2, so somewhere IJ must have code to convert S1-style layout variables to S2 or something. S1 layout sources look fairly different (I wrote one or two, a loooong time ago). Without a converter, you'd have to effectively write most of the layout over again, at which point you may as well do it on core2 - core1 is legacy, and doesn't get all the new features we implement.