Wow your Sidewinder looks great. It is a fairly late model, so I am surprised there is no jib with it. I had thought by then that MFG only made sidewinders that had a jib. Oh well - learn something new every day. And I even have now learned that by then they had stays in place because the earlier single mast, single sail models did not. I assume yours is a two piece mast?
You could get along with just attaching the jib to the forestay. Why not? The roller furling is just a convenience. On my boat, the jib cam cleats are 25 1/2" back from the main stays.
Paul
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