Hi Adventuretrimarans

Have you considered cutting the plywood with A CNC water-jet, I am sure you will be able to find one not to far away, you could also use A laser cutting service however you may not like the brown edge. Water-jet cutting will leave the material clean with no burn.

I assume you are using marine ply so the water should not be a problem. The machines are so fast the cutting time for a whole sheet will probably be under 5 minutes.

A water jet will slice through 20mm material like a hot knife through butter. You can even stack the sheets in some cases.

The kerf is minimal less than a millimetre, this allows square holes to be produced something a CNC router will not be able to produce easily, you have to allow for the tool radius.

If your files are accurate you should expect better than 0.25mm accuracy.

Farming out the cutting will allow you more time to get new orders.

Regards
John