Super, I have this plane right here, with a rear carb DLE30 on it. The cowl sits right where you put it, and there is plenty of room for this engine. I can take pictures if you want. No need to touch the firewall! It is very light and flies like a dream. In fact, it is way lighter than my AW 90/120 size Yak with the DLE 30 on it. It's like we're talking about two different planes here maybe?