Cowl mounting. Dremel out the bottom and front- leave the back strip in per instructions. I put some tape around the edges to keep from cutting fingers with fiberglass edge. Sand 1/4 back from the front of the firewall (note I left some extra overlap in the front when I sheeted the top deck so its not sanded back to the firewall, there is a little hanging over the front which is why it looks crooked but its all 1/4 inch back from the firewall). Mount engine and mount. Check cowling fit. It fits very well. Done in 15 minutes and ready for glue.