The ex. EL C425's had a different door arrangment directly behind the air intake. I removed the 2 factory Atlas doors and added one large door from a Cannon door set (from the scrap box) I removed the cast on door handles and replaced them with brass wire. I left off the handles on the 802 and 809 as they would get in the way of masking during painting. The 3 tabs on the rad section are for adjusting the rad vents, which I replicated using bits of .020 styrene