Keemos, I now see the confusion. Your motor box is about 3/4 in longer than mine. Your pic shows approx 4 1/4" and mine is 3 1/2". I couldn't understand why you couldn't just bolt on your motor like I did. When did you get your plane. I think it must have been made for the version 1 of the DLE30. That engine is shorter with the side carb. You can move the firewall back 3/4". A pain in the butt but not terrible. If You do I would use aluminum angle on the front side since you will have to cut the tenons on the firewall ply. Don't forget to keep your right thrust angle thats made on the firewall. Or cut a hole and put the carb inside the motor box and use shorter standoffs. My personal choice. Needles will be inside the box but you should still be able to drill a hole in the cowl to adjust. I just lucked out and got a later version plane, I think.