Nelson,
I have made a couple now, both work extremely well.
Woodguy gave the link to my build on Madmodder. That will save me having to post all about it on here.
For the people who swear by the single indicator method. Well that was my way of thinking until I made mine, no more rubber necking or mirrors to see the gauge, no more laying sheet material over the table slots to stop the tip of your gauge being bent, no more jumping readings as you turn the quill etc, etc.
It's OK while you are young, but as you become older and more fragile, easier is always better, which I also think makes us wiser as well.
Not that these are an old persons tool, as they are surely not, just a more efficient and easier method than previous ways of doing it, and anyone would benefit by either buying or making one. The prices have dropped dramatically for commercial units since I made mine.
John