Lewm being a wood base product I think using a waterjet cutter would adversely effect it. BKB did send me via email a product information form outlining specific use of carbide cutting tools,polyurathane adhesives only to be used and to seal the product against moisture, swings in temperature and humidity ect once all cutting is completed
I also thought about a constrained layer plinth using soft slate and panzerholz and yes I agree the panzerplywood would not be easy to obtain and in the end may prove too much for the typical DIY to work with, Mr.Porters plinths look to be a good alternative his pricing for material cost labour intensive job as such leaves little for making much profit. At first glance it looks like a simple thing to make but don't bet on it
I also thought about a constrained layer plinth using soft slate and panzerholz and yes I agree the panzerplywood would not be easy to obtain and in the end may prove too much for the typical DIY to work with, Mr.Porters plinths look to be a good alternative his pricing for material cost labour intensive job as such leaves little for making much profit. At first glance it looks like a simple thing to make but don't bet on it