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In assembling my firewall to the fuselage I struggled with getting the tunnel and lower right angle attach brackets to assemble without some major dissection. After a day of contemplation I determine that the factory supplied pilot holes in the firewall had been placed 1/2" too low. After relocating the holes everything assembled without any major alteration. I have created a step by step manual for verifying these hole locations. If anyone is interested get in touch. There are a couple jigs required which I could loan out. My e-mail is: spinningwrench@me.com