Need a way to convince an industry leader to provide feedback on your Guide? Why not offer them free promotion for their efforts? People love being a part of things like videos, interview, podcasts, or even a Guide. Offer industry leaders promotion for their efforts.
Don't hesitate to reach out to major public figures -- or industry experts -- and ask them to be part of your case study, or to partake in an interview. In most cases, these types of interactions with industry leaders are often viewed as a free promotional opportunity.
At this point, by aligning yourself with industry leaders, you're immediately giving your work credibility. You may have the world's best Guide already, but industry experts acting as an ambassador is the best way to immediately convince people that your work is of value. If you're lucky, these industry leaders may also share your work with their friends and fans.