Possible aircraft part? (Clutching at straws.)

I found a small section of aluminum framework on the beach Silversands Bay just east of Aberdour in Fife, Scotland. I actually visit the beaches of Aberdour semi-regularly to look for pieces of the china used to ballast vessels returning to the Forth, and the idea of finding something aircraft related hadn’t previously occurred to me. Aberdour is close to Dalgety Bay, which is known for aircraft disposals (and the occasional dead dog). Hawkcraig Point, at the southern end of Silversands, was a seaplane base during WW1. A fair few aircraft went into the Forth over the years, and Aberdour appears to be one of the beaches where a lot of material, such as my china, turns up fairly unscathed.

As you can see, the part is very small, measuring 50 x 45 mm. It appears to be part of a bigger object, and I cannot figure out if it would have been an open part, such as a vent covering, or closed over but deeply corroded. It has actually broken into the two parts shown since I found it, though I tried to preserve it carefully.

Of course it is most likely nothing to do with aviation, or just too hard to identify. I know a few of you have a nose for this kind of thing, so do your worst!