Many have said a derailleur hanger alignment guide could not be made from scratch, I beg to differ I had a steel tube in the garage that was flat on the end with a hole in it (just happened to be the perfect diameter). I also had a derailleur bolt (with C clip) from an old Shimano derailleur that was about an inch long. I simply gathered the other parts I needed (axle spacer and axle washer) and put it together. The 5mm derailleur bolt spins freely so you can use a hex wrech to thread it in the hanger and the pipe was a perfect length (to just meet the top of a 29" rim with the tool threaded into a hanger). While it doesn't actually have a nice feeler gauge to meet the rim, I figure I can just use a ruler. I can easily check the distance from the rim to handle of tool by just holding the ruler on the handle and extending it to the rim surface. Not bad for 5 minutes and some scrap steel
Bottom view of washer, spacer and C clip
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