They are made from .063 sheet. Also, there is a .020 spacer as on the plans to account for the thickness of the cowl. Along the vertical straight sides, decided to use piano hinge as per plans. Will certainly fit right and is easy to install/remove.

And today, our engine arrived :-)))))))))

Luckily the box/crate was in perfect condition. Except that it had been opened and labeled about twice by "security". Guess that big chunk of metal must be driving their detectors nuts *LOL*

And finally, just after opening the (thick) cardboard box. Our black/gold TMX-IO360. Looking forward to installation...