For what its worth I'd buy a well machined side rail for my OR folder in a heartbeat. Ive got a Belomo POSP in need of a solid rail to mate with the T81, ya dig.
I'm not gonna buy another optic just to get the side rail, and I'm not handy enough to make a run of the mill AK side plate fit my folder. If you bring a well machined, solid T81 side rail to the market, I could buy two and still have saved money, including shipping and the 400$ POSP.
The price of the Kobra with the included side rail is ridiculous, and thats before shipping and taxes. The people need an alternative to a 750$+ kobra, or the perpetually out of stock no drill side mounts other people have produced.
What I'm saying is, youd have my dollars