Nice looking hull,Ditto as Big Lew mentioned on the clear isinglass above the windshield.I went that way on my 23 Tsunami and like it,especially if I'm standing while steering in nasty conditions.
It allows an unobstructed field of vision.
Check out Atlantic Towers,for a custom made arch.I had one made for the Tsunami(aka sceptre)by them,and it's nice quality for a fairly reasonable cost.They have the patterns for the 23 Seacrafts and can make one to fit.
They also make a fit all universal arch in a box,but I didn't care for it.The custom is the way to go, 1.90 od tubing with mounts for radar,antennas,and other stuff.