Ideal tonearm length ?

[Daithi]

How does this tonearm compare in sound to a normal narrow one?

Neither better nor worse. As usual it depends on the horn to which it is connected to. It will play good if attached to a horn properly designed in order to match its characteristics, and awfully if attached to a horn designed for a different type of tonearm.

So its not just a matter of matching the diameter of the tonearm outlet and the horn inlet. I suppose I have little or no chance of getting it right when my plan is to make a horn from a bunch of PVC pipe fittings. Is there anyone out there who makes horns?