Scorpio/ Severn models do one if you are a guild member they list it in the gazette quite often I don't know what it's like or how it builds up though. JLTRT had one on their to do list a few years back but it never appeared. As for Slaters one I think it's quite a major job to convert I do believe there was once a discussion online possibly on Rmweb about what it would entail so a search there might find your answer. I'm hoping someone like MOK will do one one day....
Mark J