You can have one custom made at Tap Plastics.

http://www.tapplastics.com/product/plastics/cut_to_size_plastic

Here's what I did.  I stopped by a local glass company and asked them if they had any scrap acrylic pieces. The shop owner was anxious to sell me a piece of 1/2" think smoked arcylic for only $20.  I then took it back to my shop, shaped it with a band saw and then filed it down to a very smooth surface on the edges. I then through-boled it to the top of the trim piece of teak.  This way when the Admiral is doing dishes she is not slpahing water on our guests. It turned out pretty nice looking.

It's a simple do-it-yourself project. Regular wood working tools will suffice.  Use wet/dry sandpaper & a buffing wheel to polish the edges.  The hard part was finding 3/8" smoked acrylic.  A retail display fabricator friend of mine sold me a half-sheet at cost.  Still expensive.

I've found that folks tend to want to grab like a hand hold.  It's held up so far.

Gary,
Seems you're scoping out my boat.  I'm flattered.  I'm also pleased you didn't mention the dirty dishes in the sink! ;)

Seriously now, concerning your questions about the table: yes and yes.  I posted pictures in this forum few years ago and they're still up.  We hardly ever convert the dinette into a berth these days so the table stays up all the time.
https://www.catalina36.org/forum/general-discussion/folding-dinette-table
- towards the bottom

The sink covers; I have two of them.  They were originally cheap cutting boards from Ikea. I guess they still are in a sense. I made a cardboard template of the openings.  I trimmed the cutting boards to size, then planed them down to about 3/4 in. thick, sanded, oiled, etc.

Thanks again for noting my handy work.