Tell us about yourself!
I too was interested in cutting my own hair and envisioned a pair of scissors and some sort of spacer apparatus. But, I never followed through with it as I bought a Flowbee and it has worked for 18 years. It's great to see your design and instructable. I'm going to make one. It looks like fun. Thanks.
Threading doesn't match the manual. At the first guide bar (with 4 holes in it) continue through alternate holes and route thread around behind the guide disc and then straight down between the two thread tension discs. Lead the thread up through the take up spring and back down around the thread guide. From there lead straight up to the thread take up lever and then down through the guides to the needle. I didn't see a free reference on the internet, have to get the manual.