How about some pictures of your sanding jigs for making risers?
I use a double side tape for lap joints on insulation for metal buildings, very thin
Some are just flat 3/4" plywood
(https://i.imgur.com/9Kn1697.jpg)
(https://i.imgur.com/wAerHV3.jpg)
(https://i.imgur.com/uKr33jr.jpg)
I have several.
(https://i.imgur.com/dD2wNOz.jpg)
(https://i.imgur.com/ZQGNhPr.jpg)
(https://i.imgur.com/svOMHXg.jpg)
(https://i.imgur.com/r8mTbWz.jpg)
(https://i.imgur.com/wPmS9Fd.jpg)
(https://i.imgur.com/K6pNXkt.jpg?1)