Helm Boxes to mount pedistal seats

[Bushwacker]

..On a box of that style could I use plywood and laminate///router edges cut out holes for hatches???????

Hi Fred -
I think you're asking about using router bits on the FG box? Yes, they should work fine, probably better than on the PVC which tends to melt if you use too slow a feed! On thing I would do is to add another layer or two of glass around any openings. The galley seat box appears to just be a chopper gun layup (no woven roving ) so it probably isn't that strong. I was visualizing a large person sitting on the seat while punching thru some big head seas with significant shock loads, so figured a little extra reinforcement inside all the edges wouldn't hurt either! Denny