I like the Izzy Swan starter pad, for sleds it is the ticket. They work best on a square rail, but even with my Vega fence round rail they can be worked out. Pipe cut in half, so the arc fits over, and weld, or bolt the flat stuff on top. I think for the low end weight bearing some JB weld would work too. They can give as much as 20 to 24" of pre-table starting space, so width isn't a big obstacle.
Of course jigbuilding mid project adds to that deadline getting longer. Sometimes work is a real PIA. :-)