Pappy I can tell ya this much. Whatever length boat you have you really need to add 6 foot to it for full coverage. Alot of people dont take into the fact that the motor and the trailor tounge add about 6 feet to entire lenght of boat. Also if you gonna comepletely enclose it might want to add 7 feet just to be sure you can walk around it on the front and back. If I can help ya let me know. This setup of mine started out as a portable building that I bought about 6 yrs ago. Wife told me to close it in cause if I kept fishin so much I might be living in it before its over!