I just bought an Otter XT650 Cabin and put everything together only to realize I probably should have put the hyfax on first… But, it was still possible and maybe a little easier since I could stand the sled upright on it’s back. The duct tape trick is great. AND if you’re looking for something to make inserting the screws easy, use a T20 Torx bit in your cordless and you can screw the allen bolts right in and use them to suck the hyfax tight. I still needed an allen wrench to hold the bolt while I used a socket to get the nylon nuts to suck down tight too. But all in all, it’s pretty easy to install hyfax after the fact to your fish house if you decide too.