Assuming stainless rigging:
The rail with pins is a great idea. I have galvanized wire with deadeyes and lanyards and find it best to insert the bar 'inside' the lanyards and lash in place and it can stand pulling either up or down. Inside the bulwark below the bar I have cleats and can loop the line on the cleat and then lead it up to the bar and secure it and the cleat takes most of the strain, other wise it is hard to keep the bar from wanting to twist in the lashings.
With stainless you need to be sure that the lower terminations are well toggled so as not to cause stress cracks from any repeated flexing of the wire in the swage socket or the fork of a turnbuckle on a chainplate, etc.