That sounds pretty complicated to me.
I recently bought a $20 walmart digital scale that's accurate to 350# , it also will subtract the first weight from the second function. (not nearby it right now to mention brand, it's been dead-on with the scrap scales though)...

Been wondering about this type stuff myself ...to perhaps put a stronger metal casing on it, larger, and flat also (since it has human feet shaped grooves top).

Maybe check scale patents ???
There's some web-page out there where you can actually look up patents and it has the whole design for basically everything ...Unfortunately I don't know the link and no time to look ATM.



I'll be watching this thread tho' , looks interesting,
Thanks.