Ben, it seems to work well and if you are happy with it then that is the important part. I have not got an RAS to build the same thing and a mitre saw works differently in that it has a high fence as part of its structure with the support for the saw head that deflects the dust and gets in the way generally. I guess a RAS is more controlled in its ejection of the chips and dust and easier to get a good collection. Thanks for posting the video.
Chris
Everything I like is either illegal, immoral or fattening