Hi, @bfb !
I'd be happy to help. Would this require an unlimited amount of variants or would you only need variants between specific sizes? For example, you could create width and length variants between 1x1 and 10x10 pretty easily and the customer could select what's needed. If you wanted it to be fully custom, I would recommend looking into an application like Infinite Options.
Let me know if you have any questions!
|a minute ago|