I bought a blank similar to this one for a first bamboo build. I received it and it doesn't take a pro to tell they are of poor quality. Improper node spacing glue lines it was not symmetrical, meaning it was oblong not a perfect hexagon shape. For 75 dollars you can buy a decent hand plane on ebay and a culm of bamboo from golden witch and build your self a pmq. I made a pmq for my first and it was ugly, not straight not perfectly square I messed up the finish on it but it is still one of my favorite rods to fish.
If you want to build a hex go with either osd (not sure of his website address) or chris carlin (google far north rodsmiths) they are both members of the forum and both build excelent rods. I purchased a butt section from draco
http://sdbamboorods.com and was very pleased. Your can expect to spend around 300 for an un ferruled blank but its a far better investment than buying a cheapie from ebay IMHO.
Good luck with your search and have fun.