I have a bunch of notes about creating this... Congratulations! This is badly needed. These are game-changing tools that will magically prevent many unnecessary errors when it comes to PCB design and manufacturing; many hours and energy will be saved.

Unfortunately, this seems like a killer to https://kitspace.org/ (__assuming__ it turns out to be a good repository any public facing projects). Kitspace seemed like a very good effort. I am assuming for public facing projects you would integrate with distributors and manufacturers for purchasing... since... well, you're already doing some wizardry.

on that note above about projects in general: - Are you going to capitalize on the manufacturing, purchasing of parts, assembly, etc of PCBs designed on your platform? -- At a minimum: dumping a list of parts into DigiKey, integrate with PCBway... -- At a maximum: providing a 1-click software integration with many PCB manufacturing houses, all parts ordered (abstraction from distributors), hand stencils or PCBA, etc.

I hope you go further than simply some small amount of recurring revenue from $50 and ~$200 accounts... well, because... seems like you're almost there.