Helm Boxes to mount pedistal seats

[fdheld34]

Looking for ideas to build helm boxes..I do not need a baitwell etc., just some extra storage. I was thinking of making my own out of plywood and fiberglass....just a simple box and then buy access hatches and mount my peds?!?!.I have seen some boxes on marine fabrication internet sites but they are too much money..Any ideas..or has anyone made their own where they could share pics etc??? I tried a search on this topic but could not locate anything.
Thanks, Fred