rod box replacement doors?

[nipper]

I really like those doors. I have been mulling over what to do with my 91 Cuddy. I do not fish much, so I took the rod boxes (which were in pretty bad shape) out and lined the inner portion of the gunwales with indoor outdoor carpet as a first step. I had finally decided I was going to have a snap on "curtain" made for each opening out of material which would match my bimini top. You would not believe how much storage space there is once the rod boxes are taken out. Plenty for skis, ski vests, the smaller of my two anchors, fenders, etc. I do not know now though, I might just make something like this out of, oh heck, what is it called--starboard? You think I could go with 1/4" or should I go 1/2"?