Ah, I’ve made a few things in my time and I tend to look at price of a thing through the lens of whether it does what I need it to and if I could build it cheaper myself. Do you mind if I ask what you would call a fair price for a device like this, and which features you absolutely could not do without if you were to buy one?
And might well not be legally possible if all you have is an IP address, because lest we forget: