I have no cover but mine is slowly disappearing due to gauges and switches and the like. I'm sure if you use plastic or aluminum or something, it wouldn't be hard to trace around the edge of the existing piece (the one that has the squares for coin openings) to make a replacement. Once you've made something the same size and shape without the holes you could simply put it in instead of the current one and since it has no holes, it'd look like a solid piece. Hope this makes sense...the plastic piece in there now is pretty easy to pull out.
RN
See Mephisto