The biggest challenge in the past has been finding printers willing to handle explicitly adult material at a reasonable price. Thankfully, I've made friends with a small local printer who's been gracious enough to give me a small discount off their usual rate to help get these books completed. 
As always, I thank everybody for their patience. A large project like this is still a learning experience for me.  I am still prone to mistakes, but am always ready to try and correct them whenever possible. So far, everybody seems pleased with their books and art.

(Disclaimer: By contributing to this fundraiser, it is taken as confirmation that you are at least 18 years or older, and can legally receive adult reading materials.)