When a few others came up with the CoroCub I tuned right in. Thanks for those designs. I have had two Balsa Kit Sig J3-Cubs and loved them. I decided to build one and used the Sig plans as a starting point. It is a little smaller (71 inch wing span) and will fit better in my compact car. The Sig J3-Cub has a cabin are that is very weak in my opinion. I clarify this by stating that I believe a model should come out of a cartwheel in good condition. My planes tend to be heavy. Attached are 5 photos of the fuselage. All Coroplast is 4MM. I'm using 1/16 inch plywood inside the cabin area, reinforced with an additional layer of 1/16 ply at the top and the bottom of the sides. The firewall mounting is exceptionally strong as shown in the photos. The firewall is 7/16 POLY that sandwiches the 4MM Coro against another 7/16 POLY frame that has 7/16 posts for added screw attachments thru the sides and the 1/16 plywood. It is solid and a bit heavy. I hope to add a little more area to the wing to compensate and will use an OS 46FX engine. I would like to read more flying reports on the CoroCubs that are flying.