Installing MaxxFan this weekend

So.. It's time I cut a hole in my roof and let a little fresh air in. I've been putting this project off as long as I can but seeing as how I'm in AZ it is getting too darn hot in this thing to go without it. I've read all the different posts on how people have installed their fans and I am going to go with jethadens plan of using VHB tape to hold it down without putting any screw holes in the roof. I'm planning on two days so that after I cut the hole in the roof I am going to use some JB Weld to flatten out the front and back part of the roof cut out so that the fan will have a much flatter surface to adhere to. I've read through his post a few times and it seems pretty straight forward. But if anyone has any last minute advice then I am all ears to hear it. Because once I make that first cut then I'm committed to getting it done. I'll take as many pictures as I can and do a post on how it comes out. Here's hoping this weekend goes well!!!