Yieks!!!!! with shipping you're looking at $700. Why not just go with the Harken H2700 micro car, and Harken micro track and attach it to the front beam. Parts are available from Swensens in Alameda CA or even West Marine, and the cost will be 1/3.
Yeah, the price is outrageous, so I was thinking of copying it with Harken parts. Should be pretty easy to get track bent, and then fab up an attachement to the main beam.
But I'm not averse to paying real money for something if it's worth it.
Is it necessary to have a floppy self tacker (allowed to pivot about the axis of the main beam)? I guess it would help with alignment of the loads, but in light air I can imagine it would pull down on the jib
