A marvelous levitation that really looks good in photos and probably looks just as good in real life. It undoubtedly would work, and there are a number of different handlings which are possible.
The biggest problem is that you'll need to own a machine shop or have a friend who does! Although you could pay a machinist or carpenter to do much of the work, the fact remains that this gimmick should only be built by someone with the skill for careful work and safety. The description on the buyer's pages should have stated such, even if it would scare many buyers away.
The instructions and presentation(s) are explained well. A trained person would have no difficulty in making this. Mr Noble does have some spelling and terminology problems, but nothing which will slow you down.
If you have the skill and follow safety procedures, this might just be the best self-levitation on the market. You literally can perform this close up to your audience. Angles are minor - but there are some. Rehearsal is imperative; this is not something for the idly curious. This is performance magic at its best.
With the description modified in the blurb, to let one know this requires certain skills and equipment, and with a good proofreading and editing, I'd have no hesitation in giving this a full five points. As it is, it loses only one point for its flaws - because the actual method is very, very good.