thx blimpyway for comments, all analyzed and weighted ))
here is the latest shiny redirection and unintended consequence of my folly.
so far tentative name of this increment is "gridPee". There is a dual intent
1- move toward reuseable - renewable -destinkable litter
2- make easier to take urine sample using the usual litter box and litter when needed (when UTI or other pathology is suspected)
Initial construction is to have plastic grid seen in pix is just standard plastic lighting louvre. Underneath louvre is fiberglass screen material.
Underneath screen is a gap then short drop and sudden stop in bottom collection grid which is another section of same grid at top.
The grid at top will be filled and covered with safflower seeds which supposedly are non absorbing (trust but verify at this point). The top grid is present to keep claws from fiberglas screen. The air gap between screen and bottom collection grid is maintained (against weight of litter and cat) by a grid of ping-pong balls.
The bottom grid will be bottom sealed _somehow_ to form a gridded urine collection area. Viewing the "motion" catPooPee events should provide geolocation(haha) of urine and link to proper PurrrPEEtrator.
All will be documented and engineering data will be available on absolutely no schedule))