Mine was simple to do. My tanks hung underneath, exposed. I added AC/DC heat pads (I used Eternabond tape on the black tank to secure the pad that just wouldn't otherwise stay stuck). Ran wiring to the fuse box and separately to circuit breaker panel. Glued foam boards around the tanks. Filled the gaps with expanding foam. Finished it off with sheets of coroplast between the I frames. I also added several small angle strips between the frames to support the coroplast. It took a weekend to do, with lots of breaks. It's been in place about 10 years and continues to function perfectly.