I have put a kit that looks pretty much identical into my RA23. I haven't done the front doors yet, but the back windows work a charm. You'll have to make sure that your existing window setup is smooth and free, if its stiff or jerky forget about putting in the power windows unless you fix them up first.
There was a topic bought up on this just the other day in these forums, should be a page or two back if you have a look.
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