I started with a clean sheet of paper and add and made up code from here and there as a proof of concept. The design grew organically and as best I could, form followed function.
But, I think it's a dead and, both in the way it works internally and in the design layout. I have ideas for what it should look like and how it should work. In a nutshell that would be, pick a layer, associate a control slider with a metric, and adjust then save. What this would end up looking like in actual use can be easily predicted then.