Thank you for your feedback. As you can see from other reviews on homedepot.com and other websites, DreamLine's SlimLine shower bases are very popular and most customers feel they exceed their expectations for quality and performance. We regret that this was not so in your case. DreamLine shower bases are mass produced and the drain location is predetermined for each base. The technical drawing accurately illustrates where the center of the drain will be on your particular shower base. If the drain location were incorrect on your base, it would be incorrect on hundreds, if not thousands, of other similar shower bases. DreamLine would have replaced the shower base for you, had we known of your situation. Every one of our shower bases is installed exactly the same way. Customizing installation manuals to each specific size would add to the cost of the product and is not necessary. DreamLine does place our Customer Support phone number on the front of every manual to assist with questions before, during and after the installation of our product. We are hopeful that you took advantage of this and was able to find the help you needed with your installation. If you are still in need of assistance, DreamLine's Customer Support Team can be reached by phone at 866-731-2244 or by email at support@dreamline.com. We are available M-F from 8am-7pm EST and Saturday from 9am-5pm EST. Thank you again for taking the time to leave your feedback and for choosing DreamLine.