I tried for awhile to build my own set a few years ago and finally gave up. When you delete the vent window you need a scissor lift to keep everything straight and level. That was beyond my skill set. I finally found a set from One Piece Products a year ago. No matter how you do it, that's a lot of stuff in a little door. I also think that New Relics makes a kit now. It's not listed on their website , you have to call and ask for it.